# What is Density in Physics? | Definition, Formula, Units – Hydrostatics

Density in Physics Definition:
1. Density of a substance is defined as the ratio of its mass to its volume.

2. Density is the mass per unit volume of any object. It is calculated by dividing the mass of an object by its volume.

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## What is Density in Physics? | Definition, Formula, Units – Hydrostatics

Density Formula in Physics:

Density of a liquid = $$\frac{\text { Mass }}{\text { Volume }}$$
ρ = $$\frac{m}{V}$$

Where,
ρ = Density
m = mass
V = volume

Density of water = 1 g/cm3 or 103 kg/m3

Density Units:
Density is commonly expressed in units of grams per cubic centimetre.
kg/m3

In case of homogneous (isotropic) substance it has no directional properties, so it is scalar quantity.

Density Dimensional Formula:
Dimensional formula is [ML-3].

Hydrostatics:
Hydrostatics is a property of liquid or fluid in mechanics. A fluid is a material which flows at room temperature, because its upper molecule overlaps the inner molecule, which tends to flow the liquid in forward direction. In hydrostatics, we will learn about the condition of fluids when it is in rest or exerted by an external force. Here we will study the fluids in motion.