Physics- Thermal HL.txt
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Describe what is meant by an ideal gas.
Ideal gases cannot be liquefied, have no forces between molecules when not in contact, do not have size, obeys the ideal gas equation, and the internal energy is a function of T.
State what is meant by an adiabatic change of state.
A change in which there is no exchange of thermal energy / heat between the gas and surroundings. Q=0.
State what is meant by an isochoric change of state.
A change in which the pressure changes without a change in volume. W=0.
State what is meant by an isobaric change of state.
A change in which the volume changes without a change in pressure. p=constant; V/T= constant.
State what is meant by an isothermal change of state.
A change in which the pressure and volume changes without a change in temperature. U=0.
Describe the conditions for a real gas to behave like an ideal gas.
High temperature and low pressure.
State the second law of thermodynamics in terms of heat.
Heat cannot flow spontaneously from a material at a lower temperature to a material at a higher temperature.
State what is meant by entropy.
Is a system property that expresses the degree of disorder in the system.
State the second law of thermodynamics in terms of entropy.
In a system a process that occurs will tend to increase the total entropy of the system.
State what is meant by heat.
Heat is the non-mechanical transfer of energy from a material of higher temperature to a material of a lower temperature.
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