Please explain the unit of pressure ( atmospheric pressure)?? Thank you so much.

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Please explain the unit of pressure ( atmospheric pressure)?? Thank you so much.

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Answer 1 · 2017-08-10T02:30:51

Pressure, in simple terms, is a measure of the perpendicular force acting on a surface per unit area of the surface, and the simplified equation is

$P = \frac{F}{A}$ $P = F/A$

The base SI units of force are

$N$ $"N"$ $= \frac{kg \cdot m}{s^{2}}$ $= ("kg"*"m")/("s"^2)$

The base SI units of area are

$m^{2}$ $"m"^2$

So we perform the division of the units:

$P = F/A = (("kg"*"m")/("s"^2))/("m"^2) = color(red)(ulbar(|stackrel(" ")(" ""kg"/("m"*"s"^2)" ")|)$

Or, in regular units,

$color(red)(ulbar(|stackrel(" ")(" ""N/m"^2" ")|)$

This unit is equivalent to the derived unit called the pascal:

$1$ $"N/m"^2 = color(blue)(1color(white)(l)"Pa"$

Often, atmospheric pressure is measured in either bars or atmospheres, so it's useful to know the conversion factors:

$1$ $"atm"$ $= 1.01325$ $"bar"$ $= 101325$ $"Pa"$

and that

$1$ $"bar"$ $= 10^5$ $"Pa"$

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Please explain the unit of pressure ( atmospheric pressure)?? Thank you so much.

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