Atom is the smallest unit of matter which combines to form elements, compounds and mixtures.
A quark is the smallest particle in matter.
The quantity of matter in an object is called mass.
Quantity of matter in a body is known as the mass of that body.
The quantity of matter in an object is called mass.
The smallest units of matter are the subatomic particles.
The quantity of matter per unit volume is the density.
We could say what the second smallest piece of matter if we knew what the smallest piece of matter was. Since the smallest pieces of matter known are quarks-down, strange and bottom have the lowest charge -3, they can be regarded as the first, second and third smallest particles.
The force with which gravity pulls on a quantity of matter is referred to as gravity.
Mass is the measure of the quantity of matter.
Depending how you interpret "quantity of matter", that can refer either to the mass (expressed in kilograms), or the number of moles.
An atom is the smallest building block of matter that retains the characteristics of that matter.
An atom is the smallest building block of matter that retains the characteristics of that matter.