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Typical densities range from hundreds to millions (or more) of hydrogen molecules per cubic centimetre.
The density within the clumps may reach up to 105 H2 molecules per cubic centimetre or more.
Their densities in the regions studied by CO emissions are typically 1,000 H2 molecules per cubic cm.
Admittedly, at an average density of 100-1,000 molecules per cubic centimetre (compared with 100 billion billion in air at sea level), it is a pretty thin gas.
He derived practically all the consequences of the fact that pressure exerted by a gas is related to the number of molecules per cubic centimetre, their mass, and their mean squared velocity.
For a substrate concentration of 1022 molecules per cubic centimetre and a temperature of 10,000 K, -d(ln ν)/dt = 6.6 × 1010 reciprocal seconds, in which the Greek letter nu, ν, here denotes the concentration of intermediates still existent at time t.
Similar(52)
Detailed radio maps of nearby molecular clouds reveal that they are clumpy, with regions containing a wide range of densities from a few tens of molecules (mostly hydrogen) per cubic centimetre to more than one million.
The moon has next to no atmosphere – only contains about 100 molecules of gases and elements per cubic centimetre.
The molecules, however, are few and far between, only an estimated 10 million per cubic centimeter near the Moon's surface; Earth's atmosphere is about a billion times as dense.
He said the levels off Norway were about 600 "picocuries per standard cubic meter," a measure of the density of radioactive molecules, whereas the amounts detected off the United States were between 2.5 and 12 picocuries per cubic meter.
It has a density of about 0.25 gram per cubic centimetre (17 pounds per cubic foot).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com