Thermodynamics Flashcards
What is the equation for first law of thermodynamics?
∆Q=∆U+∆W
Q is taken positive when?
Heat is added to the system
Q is taken negative when ?
Heat leaves the system
U is taken positive when?
Heat of the system increases
U is taken negative when?
Temperature of the system decreases
If it is a cyclic process then?
∆Q=∆W
What is regelation?
Melting under pressure and freezing again
What remains constant in isochoric process?
Volume, ∆W=0
On a pressure volume graph what is the shape of isochor?
Isochor is a straight line parallel to the pressure axis
What is kept constant in an isobaric process?
Pressure
Isobaric process is used to convert
Heat into work
What remains constant in isothermal process?
Temperature, ∆Q=∆W
What happens in adiabatic process?
Heat doesn’t enter or leave the system. ∆Q=0
What is the shape of an isobar
Isobar is parallel to the volume axis
What is the shape of an isotherm?
A curve on pressure-volume graph
What is the shape of adiabat
Adiabat is steeper curve than an isotherm
Cloud formation in the atmosphere is the example of?
Adiabatic process
The measure of degree of hotness or coldness is?
Temperature
What is specific heat?
The amount of heat energy required to raise the temperature of one kg of substance by one kelvin
What is molar specific heat?
To raise the temperature of one mole of a substance by 1 kelvin
The equation for molar specific heat is?
∆Q = Cmn∆T
SI unit of molar specific heat is?
J mol -¹k-¹
