what does "amount of matter" mean in the definition of mass?

Question

doing a lab report on mass.

Answer 1

Mass is defined to include both matter and energy, with the numerical relationship between the two given by the famous e=mc^2. The part that is matter is also called rest mass. A photon has zero rest mass, so all of its 'mass' is energy, with none from matter. As a particle is accelerated to near the speed of light, its matter (rest mass) is unchanged, but its energy increases and therefore its mass increases.

Answer 2

There is no appliance measuring mass directly like clock for time or ruler for dimension or dynamometer for force. To tell that mass is “amount of matter” means to tell nothing. Thus a unit of mass must be determined first. Mass of 1kg means an amount of matter that weighs 9.81 N on the surface of planet Earth. Or a notorious cube of metal in Paris has mass of 1kg.

Answer 3

The rest mass does not increase when an object is travelling near the speed of light, however, it's time is slowed down with the increase of it's energy mass, possibly enabling the energy to increase by reducing itself as a part of a time = energy equation.

Answer 4

It just means the amount of, well, stuff, the physical stuff.

You take all the protons, electrons, and neutrons (if any) in what you're talking about, and that's how much matter (stuff) you have.

As the answer above mine notes, we use weight on Earth as a measure, since there's no other way of saying how much stuff.

A marble-sized piece of lead has more mass (stuff) than a marble-sized bunch of feathers.

Answer 5

amount of matter in the definition of mass means how much matter is in the mass/object.

Answer 6

the number of atoms in a object or substence
that make up the mass