... per unit volume.
what is the measure if how tightly matter is packed into a givin volume of a substance
divide its mass by its volume
A substance with matter that is more tightly packed will generally have a greater density compared to a substance with less tightly packed matter. Density is a measure of mass per unit volume, so substances with denser matter will have more mass in a given volume.
Because the molecules of the substances that make up steel are packed more tightly that are water molecules.
idkk
Oil is heavier than alcohol because oil has a higher density. Density is a measure of how closely packed the molecules are in a substance, and oil molecules are generally more tightly packed than alcohol molecules.
density
Just about anything you can see with your naked eye is made up of billions of molecules.
Solids, usually.
in solids molecules are tightly packed in liquid molecules are not so tightly packed whereas in gas they are free to move
The molar density of a substance is a measure of how tightly packed its molecules are. It is related to the substance's physical properties such as its melting point, boiling point, and density. Generally, substances with higher molar density tend to have higher melting and boiling points, and are denser.
How closely molecules are packed together is known as density. Density is defined as the mass of a substance per unit volume and reflects how tightly the molecules are arranged in a given space. Higher density indicates that molecules are more closely packed, while lower density suggests they are more spread out.