Gravity

Gravity (g) which is defined by an acceleration of 9.80665m/s² is the designated average accelerating force due to Earth’s gravity at sea level.

The real actual acceleration due to gravity varies slightly depending on geo location and altitude.

Since the Earth’s gravitational force is used in many different physical calculations a fundamental constant value of 9.80665m/s² has been standardised as the average acceleration due to gravity at sea level.

Gravity is the weakest of the fundamental forces. A bar magnet will electromagnetically pull a paper clip upward, overcoming the gravitational force of the entire Earth on the piece of office equipment. Physicists have calculated that gravity is 10^40 (that’s the number 1 followed by 40 zeros) times weaker than electromagnetism, according to PBS’s Nova.

Gravity is a major influence on many aspects of pressure measurement which include hydrostatic pressure, dead weight testers, g effect, specific gravity and barometric pressure.