# if a positive gauge pressure is doubled the absolute pressure will

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## If a positive gauge pressure is doubled, the absolute presume will ? a) Be doubled b) Be…

### Question:

If a positive gauge pressure is doubled, the absolute presume will ?

a) Be doubled

b) Be unchanged

c) Be increased, but not necessarily doubled

d) Be decreased, but not necessarily halved

e) Be halved

### Pressure

Pressure is equal to force per unit area. The SI unit of pressure is N/m2. The different types of pressure are :

- gauge pressure
- absolute pressure
- atmospheric pressure
- differential pressure

**GAUGE PRESSURE**

In fact, atmospheric pressure does add to the pressure in any fluid not enclosed in a rigid container. This happens because of Pascal’s principle. The total pressure, or *absolute pressure*, is thus the sum of gauge pressure and atmospheric pressure: *P*_{abs }= *P*_{g }+ *P*_{atm} where *P*_{abs} is absolute pressure, *P*_{g} is gauge pressure, and *P*_{atm} is atmospheric pressure. For example, if your tire gauge reads 34 psi (pounds per square inch), then the absolute pressure is 34 psi plus 14.7 psi (*P*_{atm} in psi), or 48.7 psi (equivalent to 336 kPa).

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**ABSOLUTE PRESSURE**

For reasons we will explore later, in most cases the absolute pressure in fluids cannot be negative.

Fluids push rather than pull, so the smallest absolute pressure is zero. (A negative absolute pressure is a pull.) Thus the smallest possible gauge pressure is *P*_{g }= −*P*_{atm} (this makes *P*_{abs} zero). There is no theoretical limit to how large a gauge pressure can be.

There are a host of devices for measuring pressure, ranging from tire gauges to blood pressure cuffs.

Pascal’s principle is of major importance in these devices. The undiminished transmission of pressure through a fluid allows precise remote sensing of pressures. Remote sensing is often more convenient than putting a measuring device into a system,

such as a person’s artery. one of the many types of mechanical pressure gauges in use today. In all mechanical pressure gauges, pressure results in a force that is converted (or transduced) into some type of readout.

Let us examine how a manometer is used to measure pressure. Suppose one side of the U-tube is connected to some source of pressure *P*_{abs}

such as the toy balloon or the vacuum-packed peanut jar. Pressure is transmitted undiminished to the manometer,

and the fluid levels are no longer equal. *P*_{abs} is greater than atmospheric pressure, whereas *P*_{abs} is less than atmospheric pressure.

In both cases, *P*_{abs} differs from atmospheric pressure by an amount *hρg*, where *ρ* is the density of the fluid in the manometer. *P*_{abs} can support a column of fluid of height *h*, and so it must exert a pressure *hρg* greater than atmospheric pressure (the gauge pressure *P*_{g} is positive). atmospheric pressure can support a column of fluid of height *h*

and so *P*_{abs} is less than atmospheric pressure by an amount *hρg* (the gauge pressure *P*_{g} is negative).

A manometer with one side open to the atmosphere is an ideal device for measuring gauge pressures. The gauge pressure is *P*_{g }= *hρg* and is found by measuring *h*.