surface integral calculator

Finally, to parameterize the graph of a two-variable function, we first let \(z = f(x,y)\) be a function of two variables. PDF V9. Surface Integrals - Massachusetts Institute of Technology Example 1. Calculus: Fundamental Theorem of Calculus &= 7200\pi.\end{align*} \nonumber \]. The second method for evaluating a surface integral is for those surfaces that are given by the parameterization. Let \(\vecs{F}\) be a continuous vector field with a domain that contains oriented surface \(S\) with unit normal vector \(\vecs{N}\). Solve Now. \label{equation 5} \], \[\iint_S \vecs F \cdot \vecs N\,dS, \nonumber \], where \(\vecs{F} = \langle -y,x,0\rangle\) and \(S\) is the surface with parameterization, \[\vecs r(u,v) = \langle u,v^2 - u, \, u + v\rangle, \, 0 \leq u \leq 3, \, 0 \leq v \leq 4. Introduction to a surface integral of a vector field - Math Insight We need to be careful here. Choose point \(P_{ij}\) in each piece \(S_{ij}\) evaluate \(P_{ij}\) at \(f\), and multiply by area \(S_{ij}\) to form the Riemann sum, \[\sum_{i=1}^m \sum_{j=1}^n f(P_{ij}) \, \Delta S_{ij}. Therefore, we have the following equation to calculate scalar surface integrals: \[\iint_S f(x,y,z)\,dS = \iint_D f(\vecs r(u,v)) ||\vecs t_u \times \vecs t_v||\,dA. A parameterized surface is given by a description of the form, \[\vecs{r}(u,v) = \langle x (u,v), \, y(u,v), \, z(u,v)\rangle. If you're seeing this message, it means we're having trouble loading external resources on our website. &= 80 \int_0^{2\pi} \int_0^{\pi/2} 54 (1 - \cos^2\phi) \, \sin \phi + 27 \cos^2\phi \, \sin \phi \, d\phi \, d\theta \\ \[\vecs r(\phi, \theta) = \langle 3 \, \cos \theta \, \sin \phi, \, 3 \, \sin \theta \, \sin \phi, \, 3 \, \cos \phi \rangle, \, 0 \leq \theta \leq 2\pi, \, 0 \leq \phi \leq \pi/2. The partial derivatives in the formulas are calculated in the following way: However, weve done most of the work for the first one in the previous example so lets start with that. To approximate the mass flux across \(S\), form the sum, \[\sum_{i=1}m \sum_{j=1}^n (\rho \vecs{v} \cdot \vecs{N}) \Delta S_{ij}. Use a surface integral to calculate the area of a given surface. $\operatorname{f}(x) \operatorname{f}'(x)$. The antiderivative is computed using the Risch algorithm, which is hard to understand for humans. Surface Area and Surface Integrals - Valparaiso University The following theorem provides an easier way in the case when \(\) is a closed surface, that is, when \(\) encloses a bounded solid in \(\mathbb{R}^ 3\). If S is a cylinder given by equation \(x^2 + y^2 = R^2\), then a parameterization of \(S\) is \(\vecs r(u,v) = \langle R \, \cos u, \, R \, \sin u, \, v \rangle, \, 0 \leq u \leq 2 \pi, \, -\infty < v < \infty.\). \nonumber \], For grid curve \(\vecs r(u, v_j)\), the tangent vector at \(P_{ij}\) is, \[\vecs t_u (P_{ij}) = \vecs r_u (u_i,v_j) = \langle x_u (u_i,v_j), \, y_u(u_i,v_j), \, z_u (u_i,v_j) \rangle. Now, we need to be careful here as both of these look like standard double integrals. Calculus III - Surface Integrals - Lamar University Imagine what happens as \(u\) increases or decreases. We can extend the concept of a line integral to a surface integral to allow us to perform this integration. The Surface Area Calculator uses a formula using the upper and lower limits of the function for the axis along which the arc revolves. \end{align*}\], Therefore, to compute a surface integral over a vector field we can use the equation, \[\iint_S \vecs F \cdot \vecs N\, dS = \iint_D (\vecs F (\vecs r (u,v)) \cdot (\vecs t_u \times \vecs t_v)) \,dA. Let \(S\) be the half-cylinder \(\vecs r(u,v) = \langle \cos u, \, \sin u, \, v \rangle, \, 0 \leq u \leq \pi, \, 0 \leq v \leq 2\) oriented outward. A cast-iron solid cylinder is given by inequalities \(x^2 + y^2 \leq 1, \, 1 \leq z \leq 4\). The corresponding grid curves are \(\vecs r(u_i, v)\) and \((u, v_j)\) and these curves intersect at point \(P_{ij}\). Parallelogram Theorems: Quick Check-in ; Kite Construction Template Surface integrals are important for the same reasons that line integrals are important. 6.7 Stokes' Theorem - Calculus Volume 3 - OpenStax In fact, it can be shown that. &= \langle 4 \, \cos \theta \, \sin^2 \phi, \, 4 \, \sin \theta \, \sin^2 \phi, \, 4 \, \cos \phi \, \sin \phi \rangle. 192. y = x 3 y = x 3 from x = 0 x = 0 to x = 1 x = 1. The rate of heat flow across surface S in the object is given by the flux integral, \[\iint_S \vecs F \cdot dS = \iint_S -k \vecs \nabla T \cdot dS. The Surface Area calculator displays these values in the surface area formula and presents them in the form of a numerical value for the surface area bounded inside the rotation of the arc. Since it is time-consuming to plot dozens or hundreds of points, we use another strategy. Recall that curve parameterization \(\vecs r(t), \, a \leq t \leq b\) is regular (or smooth) if \(\vecs r'(t) \neq \vecs 0\) for all \(t\) in \([a,b]\). After studying line integrals, double integrals and triple integrals, you may recognize this idea of chopping something up and adding all its pieces as a more general pattern in how integration can be used to solve problems. Multiple Integrals Calculator - Symbolab Multiple Integrals Calculator Solve multiple integrals step-by-step full pad Examples Related Symbolab blog posts Advanced Math Solutions - Integral Calculator, trigonometric substitution In the previous posts we covered substitution, but standard substitution is not always enough. ; 6.6.3 Use a surface integral to calculate the area of a given surface. In fact the integral on the right is a standard double integral. The Integral Calculator will show you a graphical version of your input while you type. Find the flux of F = y z j ^ + z 2 k ^ outward through the surface S cut from the cylinder y 2 + z 2 = 1, z 0, by the planes x = 0 and x = 1. Find the area of the surface of revolution obtained by rotating \(y = x^2, \, 0 \leq x \leq b\) about the x-axis (Figure \(\PageIndex{14}\)). To see this, let \(\phi\) be fixed. \nonumber \]. Each choice of \(u\) and \(v\) in the parameter domain gives a point on the surface, just as each choice of a parameter \(t\) gives a point on a parameterized curve. \[\vecs{N}(x,y) = \left\langle \dfrac{-y}{\sqrt{1+x^2+y^2}}, \, \dfrac{-x}{\sqrt{1+x^2+y^2}}, \, \dfrac{1}{\sqrt{1+x^2+y^2}} \right\rangle \nonumber \]. We now show how to calculate the ux integral, beginning with two surfaces where n and dS are easy to calculate the cylinder and the sphere. At its simplest, a surface integral can be thought of as the quantity of a vector field that penetrates through a given surface, as shown in Figure 5.1. &= \dfrac{5(17^{3/2}-1)}{3} \approx 115.15. \nonumber \]. Parameterizations that do not give an actual surface? By Equation \ref{scalar surface integrals}, \[\begin{align*} \iint_S 5 \, dS &= 5 \iint_D \sqrt{1 + 4u^2} \, dA \\ Let the upper limit in the case of revolution around the x-axis be b, and in the case of the y-axis, it is d. Press the Submit button to get the required surface area value. \[S = \int_{0}^{4} 2 \pi y^{\dfrac1{4}} \sqrt{1+ (\dfrac{d(y^{\dfrac1{4}})}{dy})^2}\, dy \]. Calculate surface integral \[\iint_S \vecs F \cdot \vecs N \, dS, \nonumber \] where \(\vecs F = \langle 0, -z, y \rangle\) and \(S\) is the portion of the unit sphere in the first octant with outward orientation. For a height value \(v\) with \(0 \leq v \leq h\), the radius of the circle formed by intersecting the cone with plane \(z = v\) is \(kv\). Let \(\vecs v(x,y,z) = \langle 2x, \, 2y, \, z\rangle\) represent a velocity field (with units of meters per second) of a fluid with constant density 80 kg/m3. Therefore we use the orientation, \(\vecs N = \langle 9 \, \cos \theta \, \sin^2 \phi, \, 9 \, \sin \theta \, \sin^2 \phi, \, 9 \, \sin \phi \, \cos \phi \rangle \), \[\begin{align*} \iint_S \rho v \cdot \,dS &= 80 \int_0^{2\pi} \int_0^{\pi/2} v (r(\phi, \theta)) \cdot (t_{\phi} \times t_{\theta}) \, d\phi \, d\theta \\ \nonumber \]. However, before we can integrate over a surface, we need to consider the surface itself. The result is displayed in the form of the variables entered into the formula used to calculate the. Calculate the surface integral where is the portion of the plane lying in the first octant Solution. Not what you mean? Therefore, we calculate three separate integrals, one for each smooth piece of \(S\). Math Assignments. In particular, surface integrals allow us to generalize Greens theorem to higher dimensions, and they appear in some important theorems we discuss in later sections. This book makes you realize that Calculus isn't that tough after all. The boundary curve, C , is oriented clockwise when looking along the positive y-axis. &= \iint_D (\vecs F(\vecs r(u,v)) \cdot (\vecs t_u \times \vecs t_v))\,dA. Although this parameterization appears to be the parameterization of a surface, notice that the image is actually a line (Figure \(\PageIndex{7}\)). The tangent vectors are \(\vecs t_x = \langle 1,0,1 \rangle\) and \(\vecs t_y = \langle 1,0,2 \rangle\). How could we avoid parameterizations such as this? \end{align*}\]. In the next block, the lower limit of the given function is entered. Take the dot product of the force and the tangent vector. How to calculate the surface integral of the vector field: $$\iint\limits_{S^+} \vec F\cdot \vec n {\rm d}S $$ Is it the same thing to: $$\iint\limits_{S^+}x^2{\rm d}y{\rm d}z+y^2{\rm d}x{\rm d}z+z^2{\rm d}x{\rm d}y$$ There is another post here with an answer by@MichaelE2 for the cases when the surface is easily described in parametric form . Let \(S\) be a piecewise smooth surface with parameterization \(\vecs{r}(u,v) = \langle x(u,v), \, y(u,v), \, z(u,v) \rangle \) with parameter domain \(D\) and let \(f(x,y,z)\) be a function with a domain that contains \(S\). Surface integrals are a generalization of line integrals. &= -110\pi. For example, the graph of \(f(x,y) = x^2 y\) can be parameterized by \(\vecs r(x,y) = \langle x,y,x^2y \rangle\), where the parameters \(x\) and \(y\) vary over the domain of \(f\). Then the curve traced out by the parameterization is \(\langle \cos K, \, \sin K, \, v \rangle \), which gives a vertical line that goes through point \((\cos K, \sin K, v \rangle\) in the \(xy\)-plane. Therefore, the surface is the elliptic paraboloid \(x^2 + y^2 = z\) (Figure \(\PageIndex{3}\)). Surface integral of a vector field over a surface - GeoGebra Remember that the plane is given by \(z = 4 - y\). In the case of antiderivatives, the entire procedure is repeated with each function's derivative, since antiderivatives are allowed to differ by a constant. GLAPS Model: Sea Surface and Ground Temperature, http://tutorial.math.lamar.edu/Classes/CalcIII/SurfaceArea.aspx. The parameters \(u\) and \(v\) vary over a region called the parameter domain, or parameter spacethe set of points in the \(uv\)-plane that can be substituted into \(\vecs r\). Symbolab is the best integral calculator solving indefinite integrals, definite integrals, improper integrals, double integrals, triple integrals, multiple integrals, antiderivatives, and more. Therefore, the tangent of \(\phi\) is \(\sqrt{3}\), which implies that \(\phi\) is \(\pi / 6\). 2. The mass of a sheet is given by Equation \ref{mass}. Main site navigation. Well call the portion of the plane that lies inside (i.e. For example, if we restricted the domain to \(0 \leq u \leq \pi, \, -\infty < v < 6\), then the surface would be a half-cylinder of height 6. We discuss how Surface integral of vector field calculator can help students learn Algebra in this blog post. David Scherfgen 2023 all rights reserved. The tangent plane at \(P_{ij}\) contains vectors \(\vecs t_u(P_{ij})\) and \(\vecs t_v(P_{ij})\) and therefore the parallelogram spanned by \(\vecs t_u(P_{ij})\) and \(\vecs t_v(P_{ij})\) is in the tangent plane. For example, the graph of paraboloid \(2y = x^2 + z^2\) can be parameterized by \(\vecs r(x,y) = \left\langle x, \dfrac{x^2+z^2}{2}, z \right\rangle, \, 0 \leq x < \infty, \, 0 \leq z < \infty\). &= \int_0^{\pi/6} \int_0^{2\pi} 16 \, \cos^2\phi \sqrt{\sin^4\phi + \cos^2\phi \, \sin^2\phi} \, d\theta \, d\phi \\ A surface integral over a vector field is also called a flux integral. First we consider the circular bottom of the object, which we denote \(S_1\). You can use this calculator by first entering the given function and then the variables you want to differentiate against. The result is displayed after putting all the values in the related formula. Therefore, the strip really only has one side. We have seen that a line integral is an integral over a path in a plane or in space. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. What about surface integrals over a vector field? This results in the desired circle (Figure \(\PageIndex{5}\)). \end{align*}\], \[ \begin{align*} \pi k h^2 \sqrt{1 + k^2} &= \pi \dfrac{r}{h}h^2 \sqrt{1 + \dfrac{r^2}{h^2}} \\[4pt] &= \pi r h \sqrt{1 + \dfrac{r^2}{h^2}} \\[4pt] \\[4pt] &= \pi r \sqrt{h^2 + h^2 \left(\dfrac{r^2}{h^2}\right) } \\[4pt] &= \pi r \sqrt{h^2 + r^2}. . \end{align*}\]. At the center point of the long dimension, it appears that the area below the line is about twice that above. This surface has parameterization \(\vecs r(u,v) = \langle v \, \cos u, \, v \, \sin u, \, 4 \rangle, \, 0 \leq u < 2\pi, \, 0 \leq v \leq 1.\). Furthermore, all the vectors point outward, and therefore this is an outward orientation of the cylinder (Figure \(\PageIndex{19}\)). All common integration techniques and even special functions are supported. With surface integrals we will be integrating over the surface of a solid. Surface integral calculator with steps Calculate the area of a surface of revolution step by step The calculations and the answer for the integral can be seen here. Direct link to Surya Raju's post What about surface integr, Posted 4 years ago. then The double integrals calculator displays the definite and indefinite double integral with steps against the given function with comprehensive calculations. is the divergence of the vector field (it's also denoted ) and the surface integral is taken over a closed surface. If a thin sheet of metal has the shape of surface \(S\) and the density of the sheet at point \((x,y,z)\) is \(\rho(x,y,z)\) then mass \(m\) of the sheet is, \[\displaystyle m = \iint_S \rho (x,y,z) \,dS. Direct link to Is Better Than 's post Well because surface inte, Posted 2 years ago. &= 2\pi \int_0^{\sqrt{3}} u \, du \\ Wow what you're crazy smart how do you get this without any of that background? Throughout this chapter, parameterizations \(\vecs r(u,v) = \langle x(u,v), y(u,v), z(u,v) \rangle\)are assumed to be regular. Introduction. Step 2: Compute the area of each piece. This is a surface integral of a vector field. The sphere of radius \(\rho\) centered at the origin is given by the parameterization, \(\vecs r(\phi,\theta) = \langle \rho \, \cos \theta \, \sin \phi, \, \rho \, \sin \theta \, \sin \phi, \, \rho \, \cos \phi \rangle, \, 0 \leq \theta \leq 2\pi, \, 0 \leq \phi \leq \pi.\), The idea of this parameterization is that as \(\phi\) sweeps downward from the positive \(z\)-axis, a circle of radius \(\rho \, \sin \phi\) is traced out by letting \(\theta\) run from 0 to \(2\pi\). \nonumber \]. This equation for surface integrals is analogous to the equation for line integrals: \[\iint_C f(x,y,z)\,ds = \int_a^b f(\vecs r(t))||\vecs r'(t)||\,dt. Otherwise, a probabilistic algorithm is applied that evaluates and compares both functions at randomly chosen places. For each function to be graphed, the calculator creates a JavaScript function, which is then evaluated in small steps in order to draw the graph. Here is the evaluation for the double integral. First, we calculate \(\displaystyle \iint_{S_1} z^2 \,dS.\) To calculate this integral we need a parameterization of \(S_1\). &= 80 \int_0^{2\pi} \int_0^{\pi/2} 54\, \sin \phi - 27 \, \cos^2 \phi \, \sin \phi \, d\phi \,d\theta \\ Vector \(\vecs t_u \times \vecs t_v\) is normal to the tangent plane at \(\vecs r(a,b)\) and is therefore normal to \(S\) at that point. This is the two-dimensional analog of line integrals. Find step by step results, graphs & plot using multiple integrals, Step 1: Enter the function and the limits in the input field Step 2: Now click the button Calculate to get the value Step 3: Finally, the, For a scalar function f over a surface parameterized by u and v, the surface integral is given by Phi = int_Sfda (1) = int_Sf(u,v)|T_uxT_v|dudv. \nonumber \], As pieces \(S_{ij}\) get smaller, the sum, \[\sum_{i=1}m \sum_{j=1}^n (\rho \vecs{v} \cdot \vecs{N}) \Delta S_{ij} \nonumber \], gets arbitrarily close to the mass flux. For any point \((x,y,z)\) on \(S\), we can identify two unit normal vectors \(\vecs N\) and \(-\vecs N\). In the first family of curves we hold \(u\) constant; in the second family of curves we hold \(v\) constant. Therefore, the mass of fluid per unit time flowing across \(S_{ij}\) in the direction of \(\vecs{N}\) can be approximated by \((\rho \vecs v \cdot \vecs N)\Delta S_{ij}\) where \(\vecs{N}\), \(\rho\) and \(\vecs{v}\) are all evaluated at \(P\) (Figure \(\PageIndex{22}\)). 4. Verify result using Divergence Theorem and calculating associated volume integral. In "Examples", you can see which functions are supported by the Integral Calculator and how to use them. I want to calculate the magnetic flux which is defined as: If the magnetic field (B) changes over the area, then this surface integral can be pretty tough. If \(u = v = 0\), then \(\vecs r(0,0) = \langle 1,0,0 \rangle\), so point (1, 0, 0) is on \(S\). Step #4: Fill in the lower bound value. It is used to calculate the area covered by an arc revolving in space. Stokes' theorem is the 3D version of Green's theorem. Calculate surface integral Scurl F d S, where S is the surface, oriented outward, in Figure 16.7.6 and F = z, 2xy, x + y . ; 6.6.5 Describe the surface integral of a vector field. Therefore, a parameterization of this cone is, \[\vecs s(u,v) = \langle kv \, \cos u, \, kv \, \sin u, \, v \rangle, \, 0 \leq u < 2\pi, \, 0 \leq v \leq h. \nonumber \]. In a similar way, to calculate a surface integral over surface \(S\), we need to parameterize \(S\). If you don't specify the bounds, only the antiderivative will be computed. A Surface Area Calculator is an online calculator that can be easily used to determine the surface area of an object in the x-y plane. Give an orientation of cylinder \(x^2 + y^2 = r^2, \, 0 \leq z \leq h\). The surface integral of a scalar-valued function of \(f\) over a piecewise smooth surface \(S\) is, \[\iint_S f(x,y,z) dA = \lim_{m,n\rightarrow \infty} \sum_{i=1}^m \sum_{j=1}^n f(P_{ij}) \Delta S_{ij}. Step #5: Click on "CALCULATE" button. First, lets look at the surface integral of a scalar-valued function. Figure-1 Surface Area of Different Shapes. &= \rho^2 \sin^2 \phi (\cos^2 \theta + \sin^2 \theta) \\[4pt] By Equation \ref{scalar surface integrals}, \[\begin{align*} \iint_S f(x,y,z)dS &= \iint_D f (\vecs r(u,v)) ||\vecs t_u \times \vecs t_v|| \, dA \\ Compute the net mass outflow through the cube formed by the planes x=0, x=1, y=0, y=1, z=0, z=1. This is analogous to the flux of two-dimensional vector field \(\vecs{F}\) across plane curve \(C\), in which we approximated flux across a small piece of \(C\) with the expression \((\vecs{F} \cdot \vecs{N}) \,\Delta s\). The formula for calculating the length of a curve is given as: L = a b 1 + ( d y d x) 2 d x. Why do you add a function to the integral of surface integrals? Notice that we plugged in the equation of the plane for the x in the integrand. A piece of metal has a shape that is modeled by paraboloid \(z = x^2 + y^2, \, 0 \leq z \leq 4,\) and the density of the metal is given by \(\rho (x,y,z) = z + 1\). Surfaces can sometimes be oriented, just as curves can be oriented. This surface has parameterization \(\vecs r(x, \theta) = \langle x, \, x^2 \cos \theta, \, x^2 \sin \theta \rangle, \, 0 \leq x \leq b, \, 0 \leq x < 2\pi.\). Where L is the length of the function y = f (x) on the x interval [ a, b] and dy / dx is the derivative of the function y = f (x) with respect to x. The "Checkanswer" feature has to solve the difficult task of determining whether two mathematical expressions are equivalent. Find the mass of the piece of metal. 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"source@https://openstax.org/details/books/calculus-volume-1", "author@Gilbert Strang", "author@Edwin \u201cJed\u201d Herman" ], https://math.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fmath.libretexts.org%2FBookshelves%2FCalculus%2FBook%253A_Calculus_(OpenStax)%2F16%253A_Vector_Calculus%2F16.06%253A_Surface_Integrals, \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}}}\) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\), Example \(\PageIndex{1}\): Parameterizing a Cylinder, Example \(\PageIndex{2}\): Describing a Surface, Example \(\PageIndex{3}\): Finding a Parameterization, Example \(\PageIndex{4}\): Identifying Smooth and Nonsmooth Surfaces, Definition: Smooth Parameterization of Surface, Example \(\PageIndex{5}\): Calculating Surface Area, Example \(\PageIndex{6}\): Calculating Surface Area, Example \(\PageIndex{7}\): Calculating Surface Area, Definition: Surface Integral of a Scalar-Valued Function, surface integral of a scalar-valued functi, Example \(\PageIndex{8}\): Calculating a Surface Integral, Example \(\PageIndex{9}\): Calculating the Surface Integral of a Cylinder, Example \(\PageIndex{10}\): Calculating the Surface Integral of a Piece of a Sphere, Example \(\PageIndex{11}\): Calculating the Mass of a Sheet, Example \(\PageIndex{12}\):Choosing an Orientation, Example \(\PageIndex{13}\): Calculating a Surface Integral, Example \(\PageIndex{14}\):Calculating Mass Flow Rate, Example \(\PageIndex{15}\): Calculating Heat Flow, Surface Integral of a Scalar-Valued Function, source@https://openstax.org/details/books/calculus-volume-1, surface integral of a scalar-valued function, status page at https://status.libretexts.org.

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