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

Question

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

Natalie Anton · Accepted Answer

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 = F/A#

The base SI units of force are

The base SI units of area are

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"#

Mateo Aguilar · Answer

undefined Atmospheric pressure is the force exerted by the weight of the air above a certain point on Earth's surface. It is typically measured in units of pressure such as atmospheres (atm), millimeters of mercury (mmHg), or pascals (Pa). Standard atmospheric pressure at sea level is approximately 1 atmosphere, which is equivalent to 760 mmHg or 101,325 pascals.

Kai Bowman · Answer

undefined The unit of atmospheric pressure is typically expressed in pascals (Pa), which is the SI unit of pressure. One pascal is defined as one newton per square meter (N/m²). Atmospheric pressure at sea level is approximately 101,325 pascals, or 101.3 kilopascals (kPa).