Not exactly. This is a little tricky because there are different meanings of the word density. In physics & chemistry it means how much a specific amount by volume a substance weighs. Technically it is defined as mass per unit volume. A teaspoon of Mercury weights about 14 times as much as a teaspoon of water because it's about 14 times as dense as water, or 14 times more dense (however it's clearer to say it). Mercury is more dense than iron so iron can float on a pool of mercury.
Another meaning of density is like bone density. Meaning how solid your bones are. Another is, dense fog, meaning it's hard to see through. In casual use: "My is he dense" -- meaning he doesn't understand things well.
True
true
Mass
It is the mass.
The gram. It is a unit of mass.
Mass is the measure of how much matter or "stuff" an object contains
true
Density of matter has nothing to do with amount of matter or mass that it contains. Density is mass upon volume. If mass becomes less, volume will become less proportionately.
Not exactly. The density is the mass divided by the volume occupied by that mass. So, it has the units of mass/volume.
Mass
It is the mass.
Mass
volume
Mass
volume is how much space is in an object (an object with more volume would be bigger) weight is how heavy an object feels due to gravity (an object with more weight would be harder to lift) density is how much matter is in an amount of space (an object with more density would weigh as much as an object with less density but in a smaller space/volume)
The mass of an object is the measurement of how much matter contains.
mother + nature
The gram. It is a unit of mass.