Why can you write u (internal energy) as a function of two thermodynamic properties and not all three (p, v, t)? why is the state fully specified by specifying only two properties? what is the internal energy state equation?

trigonal pyramidal

tetrahedral

trigonal planar

bent

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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