TP1 Flashcards
(38 cards)
What is absolute 0?
The temperature at which an ideal gas would have 0 pressure (-273°C)
What is the relationship between two different temperatures and pressures?
T2/T1 = p2/p1
What is the relationship involving the triple point of water?
T = T(trip) p/p(trip) = (273.16K) p/p(trip)
How do we convert between temperature scales?
Tf = 9/5 Tc + 32
Tc = 5/9 (Tf - 32)
Tk = Tc + 273.15
What is the relationship for length expansion?
Ľ = ą l0 DT
(l = l0 + Ľ)
What is the relationship for volume expansion?
DV = BV0 DT
(B = 3ą)
How do thermal stresses occur?
When expansion or contraction is prevented by clamping
What is the relationship for thermal stress?
(Ľ/l0) = ą DT
What is Youngs Modulus?
Y = (F/A) / (Ľ/l0)
(How easy an object is to stretch or compress)
How do we balance thermal stress?
F/A = -ąY DT
What are the types of deformation?
Plastic (permanent)
Elastic (reversible)
What are the yield point and the fracture point?
Yield point = where deformation goes from elastic to plastic
Fracture point = where there is too much deformation and the object breaks
What is the first law of thermodynamics?
Total energy is conserved
(DU = Q - W)
What is the relationship for specific heat capacity?
Q = cm DT
What is the relationship for molar mass?
m = nM
What is the relationship for molar heat capacity?
Q = cm DT
= cnM DT
= Cn DT
(C = cM)
What is the Dulong-Petit law?
C = 3R ≈ 24.9 J.mol^-1.K^-1
(R = molar gas constant)
What is latent heat?
Heat that is absorbed or emitted during a phase change
What is the relationship for latent heat?
Q = +/- mL
What is calorimetry?
The measurement of heat
What is the calculus relationship for heat current?
H = dQ/dt
What is conduction and what is it dependent on?
Transfer of energy between atoms, dependent on thermal conductivity
What are the relationships for heat current in conduction?
H = -k (A DT)/l
H = -kA dT/dx
(k= constant of thermal conductivity)
What does thermal resistance indicate?
Insulation properties
