Physics 221

ELEMENTS OF PHYSICS I
Physics 221

CHAPTER 14
Heat

NEW CONCEPTS

thermal (internal) energy
heat
calorie: 1 cal = 4.186 J
specific heat
calorimetry
heat of fusion
heat of vaporization
conduction
convection
radiation
- Stefan-Boltzmann constant: $\sigma$ = 5.67 x 10^-8 W/m².K⁴
- emissivity
- Stefan-Boltzmann equation

FORMULAS

Thermal energy of ideal monatomic gas:

$\begin{displaymath}U = {3\over 2} NkT = {3\over 2} nRT\end{displaymath}$

Specific heat:

$\begin{displaymath}c = {\Delta Q\over m\Delta T}\end{displaymath}$

Stefan-Boltzmann equation:

$\begin{displaymath}{\Delta Q\over \Delta t} = e\sigma A T^4\end{displaymath}$

where e is emissivity.

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