1st Law of Thermodynamics Flashcards
define the zeroth law of thermodynamics
when two objects are in thermal equilibrium with a third object they’re in thermal equilibrium with each other.
define the first law of thermodynamics
Also know as the conversation of energy (ΔE):
Qnet- Wnet = U + ΔKE + ΔPE
Heat - Work = internal + kinetic + potential
How is heat transferree
- conduction (through matter that isn’t moving)
- convection (through a moving fluid)
- radiation
What is meant when a property is referred to as ‘specific’
That property per unit mass
What can we assume when the system undergoes a reversible process
- U (internal energy) = 0
- entropy remains constant
- constant temperature
How does temperature change define a system
Small ΔT = reversible process
Large ΔT = irreversible process
Describe a polytropic process
Pressure and volume change simultaneously
PV^n = constant
n = index of expansion or compression
W = (P1V1 - P2V2)/(n - 1)
Describe an adiabatic process
No heat is transferred
-W = Δu
Describe an isothermal process
The temperature remains constant
Q = T ΔS
Equation for enthaply
h = u + pv
What is the non flow equation
Q - W = ΔU
