Question

What SI unit is used to describe liquid volume?

Answer 1

Hint: SI units are standard units of measurement defined by the international system of units for the seven base quantities of what is now known as the international system of quantities. Liquid volume is a measure of the 3-dimensional space occupied by liquid.

Complete answer:
To understand this concept of finding SI unit of liquid volume, we will first understand the following-
In the metric system of measurement, designations of multiples and subdivision of any unit may be arrived at by combining with the name of the unit the prefixes. The SI unit of volume is the cubic meter\[({m^3})\], which is a derived unit.
Litre \[(L)\] is a special name for cubic decimetre\[(d{m^3})\]. The symbol for the litre in the capital is preferred to avoid confusion. Millilitre \[(mL)\] is the special name of cubic centimetre.
\[
  1c{m^3} = 1mL \\
  1000c{m^3} = 1{\text{ cubic decimetre(dL)}} \\
  10dL = 1litre \\
 \]
By visualizing one litre as a cube, it is equal to the area present multiplied by height of the container where liquid is present.
Hence, the SI unit is cubic metre and the dimension is litre.

Additional point: SI units were improvised piecemeal from everyday physical quantities starting in the mid eighteenth century. Only later were they moulded into an orthogonal coherent decimal system of measurement.

Note:
The names of units are made plural only when the numerical value that precedes them is more than one. Symbols for units are never pluralized. Symbols of prefix that mean a million or more are capitalized and those less than a million are lower case. Do not use periods with metric unit names and symbols except at the end of sentences.