12 STASHED IDEAS
In mathematics, a matrix (plural matrices) is a rectangular array of numbers, symbols, or expressions, arranged in rows and columns.
The dimensions of the following matrix are 3x3 because there are three rows and three columns.
where Pext is the external pressure, and 🔺V is the change in volume. A classic example of this is a piston. As heat is added to the cylinder, the pressure inside the cylinder increases. The piston then rises to relieve the pressure difference between the pressure inside the cylinder and the external pressure. By increasing the volume in the cylinder, the piston has just done work. Reference the picture below.
The sum of heat and work is the change in internal energy, Δ U .
In an isolated system, q = − w . Therefore, Δ U = 0 .
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