What is a instrument used to measure pressure in chemistry

Question

For the gas unit

Answer 1

In terms of the ideal gas law: PV=nRT 

 

P = pressure in atm

V = volume in L

R = constant

n = moles

T = temperature in K

 

A barometer can be used to measure atmospheric pressure in atm. 

Answer 2

We use either pascals, which is the same N/m² (SI unit), or psi, which is the same as lbs/in² (english unit).

 

In addition to chemistry, we use these units in thermodynamics, and fluid mechanics.