9. First Law Of Thermodynamics Flashcards
What is specific heat capacity?
What is specific heat capacity is the amount of thermal energy required to produce unit rise of temperature in unit mass of the substance.
What is specific latent heat?
specific latent heat is the thermal energy required to change the state of unit mass of a substance without any change of temperature.
What is specific latent heat of fusion?
specific latent heat of fusion is the amount of thermal energy required to change unit mass of a substance from solid to liquid without change of temperature.
What is specific latent heat of vaporisation?
specific latent heat of vaporisation is the amount of thermal energy required to change unit mass of a substance from liquid to vapour without change of temperature.
What is internal energy?
Internal energy is the sum of random distribution of kinetic and potential energies associated with the molecules of a system.
What is the First Law of thermodynamics?
the first law of thermodynamics states that the increase in internal energy of a system is equal to the sum of heat supplied to the system Q and the work done on the system W.
What is the formula of specific heat capacity c ?
c = Q / mΔT
Q = mcΔT
Q= heat supplied
m = mass of substance
ΔT = rise in temperature of the substance
What is the formula of latent heat l ?
l = Q/m
What is the formula of internal energy?
U = Ek + Ep
What is the internal energy of ideal gas?
ΔU = 3/2 nRΔT
U = 3/2 nRT = 3/2 Nkt
ΔU is change in internal energy
What is the equation of first law of thermodynamics?
ΔU = Q + W
ΔU = increase in internal energy
Q = heat absorbed by the system or heat supplied to system
W = work done on system
What is the relationship between increase internal energy and work done?
When a system gains internal energy work done is ON system.
When a system loses internal energy work is done BY system.
What is an Isothermal process?
Isothermal process is one which the temperature remains constant by submerging the system in an external constant temperature environment, or if change takes place slowly, allowing temperature to equalise with its surroundings.
ΔU=0
What is an Adiabatic process?
Adiabatic process is one where change occurs so quickly that no heat flows into or out of the system or the piston is insulated.
Q=0
What is an Isochoric process?
Isochoric process occurs when a piston is stationary and volume remains constant as temperature changes.
W=0
