mass = acceleration + force

force = mass ÷ acceleration

force = mass x acceleration

acceleration = force x mass^2

How heavy a material is.

The amount of matter present per unit area.

How closely packed the particles of a material are.

The amount of matter present per unit volume.

Pressure and temperature in gases are directly and positively related.

Pressure and volume in gases are directly and positively related.

Pressure and temperature in gases are inversely related.

Pressure and volume in gases are negatively related.

Velocity

Distance

Direction

Nothing

Vectors have magnitude and direction, scalars only have magnitude.

Scalars have magnitude and direction, vectors only have magnitude.

Vectors have magnitude and direction, scalars only have direction.

There is no difference.