NATS 1945 Lecture Notes - Lecture 2: Heat Pump, Air Compressor, Geothermal Heating
28 Sep 2017
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Document Summary
Pressure: the amount of force exerted per area of contact surface. Pressure is a quantity which tells us how much of an applied force is actually felt by an object. A force is a push or a pull. What determines the extent to which a force is felt by an object is the objects surface area, that the push or pull being applied to. For example, if we have a block of wood and we push it against a wall its only this square of surface area on the wall that is in contact with the block that actually feels that push. An example of pressure is the use of snow shoes. Gas pressure typically increases with temperature, and vice versa. Therefore, pressure and t are directly proportional to each other in typical gasses, when pressure goes up, t goes up as well, if pressure goes down t also goes down.
