Discuss a pracgtical example of pressures, you may discussdisc-brake systems or

Question

Discuss a pracgtical example of pressures, you may discussdisc-brake systems or pre and post flat tire. [Discussionshould include gauge pressure, absolute pressure(inside and outsideof the pre and post flat tire)] Could I get help with this discussion? Thank you. Discuss a pracgtical example of pressures, you may discussdisc-brake systems or pre and post flat tire. [Discussionshould include gauge pressure, absolute pressure(inside and outsideof the pre and post flat tire)] Could I get help with this discussion? Thank you.

Explanation / Answer

Given :

The gradient of pressure is called the force density. For gases,pressure is sometimes measured not as an absolutepressure, but relative to atmospheric pressure; suchmeasurements are called gauge pressure (alsosometimes spelled gage pressure). An example of this isthe air pressure in an automobile tire, which might be said to be"220 kPa/32psi", but is actually 220 kPa/32 psiabove atmospheric pressure. Since atmospheric pressure at sea levelis about 100 kPa/14.7 psi, the absolute pressure in thetire is therefore about 320 kPa/46.7 psi. In technicalwork, this is written "a gauge pressure of 220 kPa/32 psi".Where space is limited, such as on pressure gauges, name plates,graph labels, and table headings, the use of a modifier inparentheses, such as "kPa (gauge)" or "kPa (absolute)", ispermitted. In non-SI technical work, a gauge pressure of 32 psi issometimes written as "32 psig" and an absolute pressure as"32 psia", though the other methods explained above that avoidattaching characters to the unit of pressure are preferred.

Gauge pressure is the relevant measure of pressure wherever oneis interested in the stress on storage vessels and the plumbingcomponents of fluidics systems. However, whenever equation-of-stateproperties, such as densities or changes in densities, must becalculated, pressures must be expressed in terms of their absolutevalues. For instance, if the atmospheric pressure is 100 kPa,a gas (such as helium) at 200 kPa (gauge) (300 kPa[absolute]) is 50 % denser than the same gas at 100 kPa(gauge) (200 kPa [absolute]). Focusing on gauge values, onemight erroneously conclude the first sample had twice the densityof the second one.

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