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    Energy Change in Reversible Adiabatic Expansion of a van der Waals gas

    Homework Statement Suppose the equation of state of a gas is Beta p=rho/(1-b rho) - beta a rho^2 where beta=1/kb T, b is a constant and rho is the molecular density, N/V. The internal energy of this gas is given by U=(5/2)N kb T - N a rho Determine the final internal energy of the gas...
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    Mathematica [Mathematica]Plotting 3D line with data point

    I can use the Show function to combine multiple plots, so I know how to plot data points and a calculated fit line in 2D, but now I want to do the same in 3 dimensions. I can plot the data points just fine in 3D, but I don't know how to draw a straight line with a know equation in 3D. My...
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