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.

Topics of Interest

The density of gases can vary greatly with changes in both temperature and pressure. The Ideal Gas Law incorporates Charles' and Boyle's Laws and also the concept of molecular weight. Charles' Law...

Gary Crossman Fluid mechanics is the study of fluids at rest or in motion. The topic is generally divided into two categories: liquids and gases. Liquids are considered to be incompressible, and...

English & SI Units of Measurement Many manufacturers publish their data in both the English system (which uses inches, pounds, degrees Fahrenheit, and related units) and Syst me Internationale d'Unit...

Pressure is defined as force divided by the area over which the force is evenly distributed. Since liquids and gases are fluid, they exert pressure on their containers evenly. The pressure of the...

This table gives various engineering material properties listed alphabetically. The units are SI. Density Acrylic 1400 kg/m 3 Density Air (2800 m) 0.9800 kg/m 3 Density Air (STP) 1.2930...