Pressure facts for kids
P = F / A
(Pressure = Force divided by Area that force is acting on)
Pressure is directly proportional to force and inversely proportional to area, so the same amount of force applied by a hand will produce less pressure than when applied by something smaller, like a finger.
Atmospheric pressure is the pressure exerted by oxygen and other molecules (the atmosphere basically) on a body/point/area. Atmospheric pressures is measured using instruments such as the barometer which uses the principles of pressure and vaccum to measure the atmospheric pressure.
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Pressure Facts for Kids. Kiddle Encyclopedia.