What is the difference between density,mass and volume?


You are talking about three different but interelated properties of something

Volume is the physical size of something, a liquid, a solid, or a gas, and usually expressed as the cube of a linear unit, e.g. Cubic inches, cubic centimetres, or even cubic metres! Some substances traditionally have specialised units e.g. Gasoline - litres or gallons.
The important point is that volume tells you nothing about the materials mass

Mass is the physical property of something that determines its resistance to being accelerated, or the force of gravitational attraction with another body. The unit of mass is a kg, or pound or ton, or ounce
Thus a bag of sand is gravitationally atracted to the centre of the earth with more force than a similar bag full of feathers. This force is known as its weight. The important distinction between mass and weight is that the mass of a body doesnt change, but its weight will change depending on gravity. So a mass of 10 kg of lead will weigh 10 kg on earth but only 1.6 kg on the moon even though it's mass remains as 10kg

Density is the physical property which defines the the amount of Mass within a physical volume. It is measured in kg per cubic centímetre or pounds per cubic inch. Thus if we have a cubic Centímetre of lead, it has more mass than, say, a cubic Centímetre  of wood. The former is said to be denser than the latter, because it has more MASS in the same volume.

We have relation density= mass/volume

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