john Dalton
Mass is the measure of the quantity of matter.
Mass is a quantity that describes the concentration of matter. Mass is an aggregate measure of matter and it also determines the weight of an object.
Theoretically and mathematically... yes. According to Newton's law every time there is an action, an equal and opposite reaction will occur as well. Meaning every time there is an even in space that creates matter, the same amount of anti-matter will also be created.
Mass is an inherent property of matter.
density
Sir Antoine Lavoisier
A closed reaction chamber is simply a chamber that is closed with matter inside of it. The chamber measures how much matter there is before and after a reaction.
The quantity of matter in an object is called mass.
Quantity of matter in a body is known as the mass of that body.
A substance that cause or speeds up a chemical reaction while the substance itself remains unchanged
The quantity of matter in an object is called mass.
The quantity of matter per unit volume is the density.
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.
Mass
the quantity of matter can be measured by its volume (a measuring flask), weight (a beam balance), and count (tally). ============================