Density of materials

What is the formula for density?

Density = mass/volume (P=m/V)

What is the SI unit of density?

Kilograms per cubic meter (kg/m³).

How do you find the volume of a regular solid?

Measure dimensions with a ruler and use a formula (e.g., Volume=length×width×height

How do you find the volume of an irregular solid?

Submerge the object in a measuring cylinder filled with water and record the displaced volume.

What equipment is used to measure mass?

A balance or scale.

Why is density a useful property of materials?

It helps identify substances and determine their applications.

What happens to density if the mass of a material increases while its volume remains constant?

Density increases.

What happens to density when a material expands?

Density decreases because the volume increases while mass remains constant.

What is the density of water?

Approximately 1000 kg/m³

What does it mean if an object floats in water?

Its density is less than 1000 kg/m³

Why are gases less dense than liquids and solids?

Gas particles are far apart, so they occupy a much larger volume.

How does temperature affect the density of a substance?

Density decreases as temperature increases because most substances expand when heated.

What is the relationship between mass and density?

Mass is directly proportional to density for a given volume.

Can two materials have the same mass but different densities?

Yes, if their volumes are different.

How do you calculate the mass of an object from its density and volume?

Mass=Density×Volume.