From Flow Measurement

Some data provide specific volume rather than density. This term is volume/
mass and is merely the reciprocal of density. Tables and graphs for properties of
steam show specific volume of steam rather than density. English system units are
ft3/lb, and SI units are usually m3/kg.

Density can be derived from the volumetric expansion equation. For example:
The density of 100% sulfuric acid at 20°C is 1.8305 kg/liter. What is its
density at 50°C? The equation is found to be:

  Vt = V0 [1 + A(t) + B(t)2]
where:  
 Vt = volume at t°C
V0 = volume at 0°C
A = 0.5758-3
B = –0.432-6
 
Solving:  
 

 

 

 

© 2001 ISA

Products & Services
Flow Controllers
Flow controllers monitor and maintain flow-rate variables, typically in process applications.
Gas Flow Meters
Gas flow meters are used for measuring the flow or quantity of a moving gas in an enclosed pipe or passage.
Liquid Flow Meters
Liquid flow meters are used to measure the volumetric flow rate or amount of a moving liquid.
Volumetric Gas Flow Switches
Volumetric gas flow switches are devices with a switch output used for measuring the flow or quantity of a moving gas in terms of a unit of volume per unit time, such as cubic feet per minute.
Volumetric Liquid Flow Switches
Volumetric liquid flow switches measure the flow or quantity of a moving fluid in terms of a unit of volume per time, such as liters per minute. These flow sensing devices have a switch output.

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