As explained by kinetic molecular theory, why does a gas take the shape and volume of its container?

Which term refers to a property that depends only on the amount of a substance? ©@

What is the density of the black hole

Match the following items. 1. high-intensity bundle of energy being emitted from some decaying nuclei gamma ray 2. particle radiating from the nucleus of some atoms beta particle 3. negative particle identical to an electron but radiating from a decaying nucleus alpha particle