PHYS 1080 Lecture Notes - Lecture 15: Phase Boundary
5 Dec 2016
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Temperature: proportional to average kinetic energy of molecules (1/2 mv^2). avg = 3/2 kbt. Thermal energy: total energy of all the molecules. E = sum. n (1/2 mv^2) = 3/2 nkbt. Heat (q): energy transferred between objects soley due to a temperature difference. Add or remove an amount of heat q to an object of mass m will typically change the temperature. Q/mcp = delta t > q = delta t mcp. Heating will occur at rate given by heat capacity until phase boundary is reached. The heat required at the phase boundaries is a form of potential energy locked in the structure of the material. Latent heat (l): heat added to an object which recon gures the molecules in the material (here delta t = 0) (j/kg). Q = mlf q = mlv (latent) heat of fusion (latent) heat of vaporization. Take 1. 5 oz of gin: m. g = 3. 4x10^-2 kg. Q. gin = m. gin x c. gin x (t. f - t. i)
