Because the air that fills our atmosphere has a weight, it also exerts pressure over the surface of the Earth. This pressure is referred to as “atmospheric pressure”, “air pressure”, or “barometric pressure”. At sea level, experiments have proven that the atmospheric pressure is 14.696 psi. Since the density of air decreases as the elevation […]
Pressure is the measurement of a force applied over an area. The equation to calculate pressure is Pressure equals Force divided by Area. Imagine that a 200-pound man stood on top of a table that has a 10 square foot area. Assuming the man’s weight could be evenly distributed across the table, the pressure exerted […]
Weight and mass are core refrigeration concepts that are often misunderstood to be different terms that describe the same properties. However, “weight” and “mass” are related, but not identical properties. Mass is the amount of matter in an object and is measured in pounds-mass, ounces, grams, and kilograms. There is also a lesser-known unit of […]
Rate is the quantity of something measured against something else. For refrigeration, the “something else” will always be a unit of time. When length is measured against time, the result is a speed or velocity measurement. Examples include miles per hour and feet per minute. When volume is measured against time, the result is a […]
Volume is the amount of space that something occupies and is calculated by multiplying the area of an object by its height. Since it is a cubic measurement, the units used to measure volume are often cubed. Examples include inches cubed, feet cubed, and meters cubed. Other common volume units are gallons and liters, which […]
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