# Thread: Mass of the Universe

1. I've had this thought for a while; though, I've never taken the time to research on it. Can someone please confirm or invalidate the following statements:

1. If there is only one universe, that universe is constant; thus, that universes composition and mass are constant. Matter can alternate in forms, but will always occupy the same mass in the universe. An example of this might be 1 inch by 1 inch ice cube melting into water which contains the same overall mass and occupies an equal position in space.

2. If parallel universes are proven as well, as a method of traversing between different universes, then matter is infinite and each separate universe of the overall multiverse can vary in size as the matter which occupies one universe can traverse into another.

Not sure if I'm right on the money or way off. If my point 1 is true, then--based on my understanding of the big bang theory--I do not see how it could be possible.

2.

3. Originally Posted by Master Jake
Matter can alternate in forms, but will always occupy the same mass in the universe. An example of this might be 1 inch by 1 inch ice cube melting into water which contains the same overall mass and occupies an equal position in space.
Same mass, yes. Same volume, no. The (liquid) water will have less volume than the ice had.

Bodies don't "occupy" mass. They have mass. A body occupies some space (volume), and a position in space.

A body changes position when it moves. It changes volume when it expands or contracts (or is compressed).

Mass can be transformed into energy and vice versa. The good old principle of conservation of mass and the equally good and old principle of conservation of energy are in fact one principle: of conservation of (the sum of) mass and energy.

4. Originally Posted by Leszek Luchowski
Same mass, yes. Same volume, no. The (liquid) water will have less volume than the ice had.

Bodies don't "occupy" mass. They have mass. A body occupies some space (volume), and a position in space.

A body changes position when it moves. It changes volume when it expands or contracts (or is compressed).

Mass can be transformed into energy and vice versa. The good old principle of conservation of mass and the equally good and old principle of conservation of energy are in fact one principle: of conservation of (the sum of) mass and energy.
But why does the water have a different volume than that of the ice cube? Basing this on those egg-carton looking things that people used to use to freeze water into ice. You fill one of those little cube containers with water and leave it in the freezer. Come back later and it is ice. It still appears to occupy the same space as the water did. Likewise, taking that ice out of the freezer and letting it melt back into water. I don't understand how alternating the form of something changes its volume.

5. Think about this: if ice is the same volume as water, and therefore the same density, why does it float?

6. Originally Posted by Master Jake
If parallel universes are proven as well, as a method of traversing between different universes, then matter is infinite and each separate universe of the overall multiverse can vary in size as the matter which occupies one universe can traverse into another.
Matter or energy cannot traverse from one universe to another, they're discrete "bubbles".

Events occur in all universe's simultaneously. Every universe is exactly the same as all the others. It may even be possible that there is another you in another universe!

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