Thermodynamics Flashcards
Equation for linear expansion… L =
L = Lo + α Lo ΔT
Heat flow by conduction… dQ/dt =
dQ/dt = k A ( (TH - TC) / L)
Heat transfer in phase change… Q =
Q = +- m Lf
Stefan-Boltzmann law… H =
H = A e σ T4
Surface area of a sphere… A =
A = 4 π r2
Ideal Gas Law p V =
p V = n R T
Equation for volume expansion… ΔV =
ΔV = β Vo ΔT
Coefficent of volume expansion β =
β = 3 α
Thermal stress F / A =
F / A = -Y α ΔT
State the temperature at which water is most dense…
4 °C
Equation that can be used to relate temperature, preasure and volume…
p1V1 p2V2
——- = ——
T1 T2
State the Second Law of Thermodynamics…
It is impossible for any process to have as its sole result the transfer of heat from a cooler to a hotter body.
State the First Law of Thermodynamics…
When heat Q is added to a system while the system does work W, the internal energy U changes by an amount equal to Q-W.
ΔU = Q - W
Emisivity e =
rate of radiation from a particular surface at temperature T
rate of radiation from an ideal radiating surface at temperature T
Specific heat capacity Q =
Q = mc ΔT
