Light-gas gun
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The light-gas gun is an apparatus for physics experiments. It is a highly specialized gun designed to generate extremely high velocities. It is usually used to study high-speed impact phenomena, such
A light-gas gun at Rice University. Using hydrogen gas and powered by a shotgun shell, it achieves a velocity of 7 km/s. Used during the development of the Fermi Gamma-ray Space Telescope shield.
Two light-gas guns at Arnold Air Force Base's Hypervelocity Ballistics Ranges.
In this Kinetic Energy Weapon test, a seven-gram Lexan projectile was fired from a light-gas gun at a velocity of 23,000 feet per second (7,000 m/s; 16,000 mph) at a cast aluminum block.
Density
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Density is the ratio of a substance's mass to its volume. The symbol most often used for density is ρ, although the Latin letter D can also be used: ρ = m V, where ρ is the density, m is the mass, and
A test tube holding four non-miscible colored liquids with different densities
One-troy-ounce (480 gr; 31 g) samples of germanium, iron, aluminium, rhenium and osmium. The differences in size are due to differences in density.