Sentences with phrase «hydrogen atoms per»

The dark matter was about 1000 light - years across and had an even density equivalent to four hydrogen atoms per cubic centimeter.

An easy - to - measure current density of one microampere per square centimeter corresponds a stream of about six trillion (6 × 10 ^ 12) single hydrogen atoms per second per square centimeter.

At present, the density of ordinary baryons and radiation in the universe is estimated to be equivalent to about one hydrogen atom per cubic metre of space.

Near the Sun the average density of interstellar gas is 10 − 21 gm / cm3, which is the equivalent of about one hydrogen atom per cubic centimetre.

Not exact matches

Their reaction is created by colliding two plasma balls made of hydrogen atom cores at one million miles per hour.

Pagels (1984) points out that if the relative masses of protons and neutrons were different by a small fraction of 1 per cent, making the proton heavier than the neutron, hydrogen atoms would be unstable since the protons that constitute their nuclei would spontaneously decay into neutrons.

To test this, Laricchia's team fired positronium atoms at 1100 to 4400 kilometres per second into various gases, including hydrogen, krypton and water vapour.

Just as the quartz crystal in a Swiss watch keeps time by vibrating at a steady frequency (about 32,000 cycles per second), the maser coaxes a supply of specially selected hydrogen atoms to emit radio waves at an unwavering 1.42 billion cycles per second.

Cosmic strings are line - like objects with a mass per unit length of about 1017 tonnes per metre and a thickness of only 10 22 of the radius of a hydrogen atom.

Water, for example, with one oxygen and two hydrogen atoms, can form two hydrogen bonds per molecule.