Credit: Dennis van Zuijlekom CC-BY-2.0
Q:

# How do pressure gauges work?

A:

A pressure gauge allows a fluid to enter from the item or equipment being measured and reacts by moving a calibrated rod inside it. The pressure can be correctly read when the rod has moved to its maximum position.

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To measure the pressure of a tire, place the gauge on the valve stem of the tire, pressing the pin to let pressurized air rush into the gauge. A piston inside the gauge travels a distance that matches the air pressure. The pressure gauge can only measure up to a specified maximum. When it’s disengaged from the valve stem, a spring inside the gauge pushes the piston back to its original position.

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## Related Questions

• A:

Forces are measured by using devices such as bathroom scales and spring balances, also known as force meters or Newton meters. When the mass and acceleration of an object are given, forces can also be measured using the equation F = ma, where "F" indicates the force, "m" denotes the mass and "a" represents acceleration.

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The difference between high and low viscosity is the thickness of the material being measured. Low viscosity refers to substances that are thin, such as water, while high viscosity substances are thick. An example of a high viscosity liquid is syrup.

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Acceleration is measured by using an accelerometer, an electromechanical device that measures acceleration forces. Dimension Engineering explains that these forces can be static, such as those caused by gravity, or dynamic, as in those that cause motion.