Engineering Thermodynamics
The __________ states that change of internal energy of a perfect gas is directly proportional to the change of temperature.

Joule's law
Gay-Lussac law
Boyle's law
Charle's law

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Engineering Thermodynamics
An isolated system is one in which

Both energy and mass cross the boundaries of the system
Mass does not cross boundaries of the system, though energy may do so
Neither mass nor energy crosses the boundaries of the system
Mass crosses the boundary but not the energy

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