Atmospheric pressure

We live on the ocean floor that air has weight. The depth of our atmosphere at sea level is about 60 miles. The deeper sea air above us, the more atmospheric pressure. Shallow, the lower his blood pressure.

We can change our depth, rising above the sea level. Man at the top of a high mountain less atmosphere above it, than a man at sea level. People in the plane, even less than the man at the top of the mountain. In the aircraft cabin must be pressurized to avoid the effects of extreme pressure changes caused by altitude.

In addition to its depth, weight, and, therefore, the pressure of our environment depends on the density, or severity, of this fluid. The heavier (denser) the atmosphere, the more pressure we feel. Air drier for denser (heavier)than the humid air. Cold air is denser than warm air. That is why a cold, dry air causes higher barometric pressure, and warm, moist air causes the lowest. Altitude and weather conditions, affecting the barometric pressure.

Cooling system pressure can exist in three ranges; above and below the atmospheric pressure. The vast majority of modern refrigerating systems used in comfort air conditioning work work above atmospheric pressure.

Two pressure measuring system used when working with mechanical cooling systems: absolute pressure and overpressure. Measurement of absolute pressure used for reporting and forecasting of weather, as well as for products and systems engineering work. It is also used for pressure-enthalpy diagram for refrigerants. Because of this last application, you must understand, absolute pressure.

Manometer for pressure measurement is used for all services in the mechanical refrigeration systems and sensors that remain installed in the systems for routine measurements. Unless otherwise stated, assume pressure used in the service of work pressure sensor...