Replies: But, there is still the same amount of matter.

The amount of matter carried by a large river is enormous.

However, the amount of matter and energy remains the same.

Mass is the amount of matter there is in some body.

The mass or the amount of matter in something determines how much energy that thing could be changed into.

Do you realize how small an amount of matter this is?

A given amount of matter may change from one state to another depending on its temperature and pressure.

Another goal was to reduce the amount of matter going to landfills.

Mass is the amount of matter (material) that makes up an object.

It had a modest amount of dark matter, whatever that is.