**Volume Measurement Defined**

Volume measurement is done with three dimensions in mind. The volume of any object may be determined by multiplying the width by the length by the height. The measurement of volume may also be expressed as the amount of 3-D space encapsulated inside the boundaries of a three-dimensional object.

Certain principles and truths accompany the measurement of volume such as the fact that if two objects are the same in their linear and area measurements, then they will have the same volume. If the object rotates, spins, changes shape in any way, it still does not change its volume.

Another law that remains true with volume measurement is the fact that if an object is cut in half, the two halfs will contain half the volume of the original object. If these two objects are rejoined, then they will return to the original amount of volume contained in the original object.

**Measurement of Volume**

The International System of Units(SI) has determined that volume will be quantifiably measured by using the base unit of the cubic meter. Further, an objects volume is said to be what can fit inside a container and does not inclue the amount of volume the container uses.

Measurement of volume is also accomplished by determining the amount of fluid displacement. Fluid displacement is explained to be a phenomenon that occurs when an object is immersed in a fluid and that same fluid is pushed out of the way and the space is taken up by the object doing the pushing or displacing. The measured amount of volume is then directly proportional to the amount of fluid being displaced.

**Thermodynamics and Volume Measurement**

Thermodynamics is an area of physics that seeks to understand heat and temperature and how they relate to the dynamics of energy and work.

There are four basic laws of thermodynamics. They are stated as follows:

**Zeroth Law of Thermodynamics**: If two systems are in thermal equilibrium with a third system, they are in thermal equilibrium with each other.

**First Law of Thermodynamics**: The law of conservation of energy states that the total energy of an isolated system is constant; energy can be transformed from one form to another, but cannot be created nor destroyed.

**Second Law of Thermodynamics**: The second law conerns itself with natural processes when it states that the total entropy can never decrease over time for an isolated system. Total entropy always increases and this process is not reversible.

**Third Law of Thermodynamics**: The entropy of a system approaches a constant value as the temperature approaches absolute zero.

In thermodynamics, the volume measurement actually becomes an important physical quantity for describing its thermodynamic state. The specific volume of an object or system is the objects volume per unit of mass. Volume can be impacted by the state of the object and can be changed according to the external dynamics such as pressure and temperature exerted on to it.

**US Conventional Units**

cubic inches (in.3 or cu.in.)

cubic feet (ft3 or cu.ft.)

cubic yards (yd3 or cu.yd.)

1728 cu. in. = 1 cu. ft.

27 cu. ft. = 1 cu. yd.

1 cu. ft. = 7.48 gal.

**SI Metric Units**

1 liter (L) = 1000 cubic centimeters (cm3)

= 1.05 quarts (qt)

= 61 cu. in. = 0.035 cu. ft.

100 cubic centimeters (cm3) = 1 cubic decimeter (dm3)

1 cubic meter (m3) = 1.3 cu. yd.

**HVAC and Volume Measurement**

The field of HVAC is concerned with volume as it relates to air flow, constant volume-variable temperature, variable volume-constant temperature, and variable volume-variable temperature systems. Supply air, unit capacities, liquid and gas refrigerants and other properties require a working knowledge of the thermodynamics impacting them.

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