Thermal Properties of Solids Flashcards
Formula of Interconversion?
R-Ice/Boil-Ice
Ice and boil point of Fahrenheit and Kelvin Scale?
32°&212°
273.15&373.15
New length after expansion?
L’=L(1+alpha∆T)
∆L=Lalpha∆T
New density?
D’ =D(1-gamma∆T)
∆D= -Dgamma∆T
1 Day has how many seconds?
86,400 seconds
Thermal stress?
F/A = Yæ∆T
Application of Thermal Properties?
- Materials
a. Inver(Alloy of Fe & Ni)
b. Pyrex Glass (Chemistry Lab Apparatus)
Both have low Alpha. For Inver Alpha is independent of T.
2.Bimetallic Strip
Difference in Alpha
Auto cut Mechanisms
- Apparent Expansion of Liquid
A=L-S - Anomalous Expansion of Water
Values to be remembered?
1 cal=4.2J
S of water = 1 cal/g/k or 4200 J/Kg/k
S of ice=2100 J/Kg/k
Principle of Calorimetry and an important formula?
Qin = Qout
Latent heat of fusion of ice to water?
80 calories per gram
Latent heat of vaporization of water to gas?
540 calories per gram
Heat flow rate formula?
∆Q/∆t = KA∆T/L
Formula of Emissive power?
Power/Area
Formula of absorbtive power?
Energy absorbed/energy incident
What is emmissivity?
Emissive power of a body/Emissive power of a black body
Newton’s law of cooling equation?
T1 - T2/∆t = K(T1+T2/2 - To)
Stephen’s law equation?
P = (Sigma)AE(emmissivity)T⁴
Where Sigma=5.67×10^-8 W/m²k⁴
Equation of Wein’s displacement law?
Wavelength × Temperature = b (2.89× 10^-3)
