Die a lonely death in space.
If, OTOH, you had a bag of tennis balls, you could hold one in front of you, and poke a hole in it on the OPPOSITE side from where you wanted to go. The escaping air pressure in the tennis ball would move you. . . slowly, but surely.
The gasses are compressed mainly so they can fit in a smaller space. If the gasses were not compressed it would be very inconvenient and costly to reserve the space for the quantities of gas needed.
Compressed files can save considerable amounts of hard drive space.
Laptops have a tenancy to over heat a lot because of their compressed space for the hardware and not enough room for fans. For desktops i would have to say a micro-tower because of the compressed space, dust getting in and having no where to go and not a lot of fans.
An ideal gas can be both compressed and expanded. In regards to ideal gas, when the gas is expanded or compressed, the molecules will remain the same. In order for the count of molecules to change, gas would need to be added. The molecule count can also change if gas escapes.
The answer would depend on the altitude (or depth) of the air you're measuring. Because air can be compressed, the weight of the atmosphere (or atmosphere plus water if it is submerged) on top of the air you're measuring determines the volume, or space, the air takes up. The more the weight, the smaller the space the compressed air would take up. Temperature is also a factor as air becomes denser and compresses (the molecules become more tightly packed) as it gets colder.
Since a "mole" is 6.02 x 10^23, two moles would be 12.04 x 10^23 baseballs. As 6.02 x 10^23 is Avogadro's number, if you have two Avogadro's you only need a lemon to make some nice guacamole! :)
Some physicists believe that there is something called a singularity, which would be found at the center of a black hole, which is compressed by gravity to the point of having zero volume, but which would still have mass. This has not been confirmed and there are other possible mathematical models of black holes. And other than that, no, nothing that does not occupy space would have mass. Mass occupies space.
Hydrogen is stored in liquid form in a tank, at low temperature. It would not be practical to store it as a gas, since it would take up too much space, or if sufficiently compressed, would have an excessively high pressure.
Technically yes. Although the amount of change would be negligible. All matter can be compressed to varying degrees.Technically yes. Although the amount of change would be negligible. All matter can be compressed to varying degrees.
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Not much. The whole point of a black hole is that a lot of matter is concentrated in a fairly small space. The Schwarzschild radius of the Earth - i.e., the size into which it would have to be compressed to become a black hole - is less than 1 cm; the Sun would have to be compressed into a sphere with a radius of about 3 km. In general, the Schwarzschild radius is directly proportional to the mass. In a real black hole, the Schwarzschild radius corresponds to the event horizon - the point of no return.
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