You know that volume is the space occupied by a state of matter. So, what is the SI unit for volume considered for measuring it? Well! The SI unit for volume is m³. However, many other units are employed for the volume in Physics. This page discusses the units of volume list in detail.
The volume is a basic physical quantity, we consider it a derived quantity and it expresses the three-dimensional proportions of an object.
So, we understand that the SI unit of volume in Physics is quantified by using the SI derived unit, the cubic metre.
Volume in Physics
Volume is the amount of three-dimensional space enclosed by a closed surface in terms of numerical value.
For example, the space that a substance can be solid, liquid, gas, or plasma, or any space-occupying shape.
The volume of a container is considered to be the capacity it can hold; i.e., the amount of fluid, a gas, or a liquid that the container can hold, rather than the amount of space the container itself displaces, just like Buoyant force in the water.
Points to Note:
3-D mathematical shapes are also assigned volumes. Volumes of shapes, like the regular, straight-edged, and circular shapes can be easily calculated by using arithmetic formulas.
Volumes of complex shapes can be calculated by using integral calculus only if the formula exists for the shape's boundary.
1-D s like lines and 2-D shapes, such as squares are allotted zero volume in the three-dimensional space.
Volume of a Solid
The volume of a solid, either regularly or irregularly shaped, can be determined by fluid displacement.
Where the displacement of liquid is used for calculating the volume of a gas. The combined volume of two substances is always greater than the volume of just one of the substances (liquid or gas). However, sometimes it happens that one substance dissolves in the other, and in these cases, the combined volume is not additive.
Units of Volume List
Volume measures capacity. So the SI unit of volume is a unit for measuring the capacity or the proportions of an object or space. The unit m³ is mostly used to specify the volume of substances or a liquid (fluids).
However, students must keep in mind that mass and volume are two different physical quantities. While the unit of volume is an interesting topic, so, let’s have a look at what units are used all over the world below in a tabular form:
Volume in Thermodynamics
In the field of thermodynamics, the volume of a system is a significant extensive parameter for describing the state’s thermodynamic state.
The specific volume is an intensive property, it is the volume of the system per its unit.
Volume is a state function and is independent of some thermodynamic properties like pressure and temperature.
For an ideal gas, the volume is related to the pressure and temperature, as per the ideal gas law.
Volume Units Conversion
Any unit of length gives a derived SI unit of volume, such as the volume of a cube that has sides of a given length in metres.
A cubic centimetre or cm3 is the volume of a cube whose sides are one centimetre, 1 cm in length.
In the International System of Units or SI, the standard unit of volume is the cubic metre (m3).
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In the metric system, the unit of volume also includes the litre (L), where one litre is equal to 10-centimetre cube.
Therefore, 1 litre = (10 cm)3 = 1000 cubic centimetres
= 0.001 cubic metres,
1 cubic metre is equal to 1000 litres.
Small amounts of liquid are measured in millilitres units, where
1 millilitre = 0.001 litres or 1 cubic centimetre.
In the same way, large amounts are measured in megalitres, i.e.,
1 million litres = 1000 cubic metres or 1 megalitre.
Various traditional units of volume are still in use, including the following units of volume list:
the cubic foot,
the cubic yard,
the cubic mile,
the fluid ounce,
the fluid dram,
the acre-foot, and
the board foot