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Since the atmosphere of the Earth has a mass of about 5.14 × 10 18 kilograms (1.133 × 10 19 lb), [24] the mass of 3 He in the Earth's atmosphere is the product of these numbers, or about 37,000 tonnes (36,000 long tons; 41,000 short tons) of 3 He. (In fact the effective figure is ten times smaller, since the above ppm are ppmv and not ppmw.
In the Local Interstellar Cloud, the proportion of 3 He to 4 He is 1.62(29) × 10 −4, [6] which is ~121 times higher than in Earth's atmosphere. Rocks from Earth's crust have isotope ratios varying by as much as a factor of ten; this is used in geology to investigate the origin of rocks and the composition of the Earth's mantle . [ 7 ]
These are the only two stable isotopes of helium. See the table below for the values of these physical quantities. The density of liquid helium-4 at its boiling point and a pressure of one atmosphere (101.3 kilopascals) is about 125 g/L (0.125 g/ml), or about one-eighth the density of liquid water. [1]
The levels are based on locations from the original Sonic the Hedgehog (1991) and Sonic the Hedgehog 2 (1992), [b] [1] [2] and feature elements such as slopes, bottomless pits, vertical loops, corkscrews, springs, and boost pads, as well as power-ups like shields, invincibility, and speed shoes.
1–3 kg Adult domestic tortoise: 2.5–4 kg Newborn human baby [74] 4.0 kg Women's shot [75] 4–5 kg Housecat [76] 7.26 kg Men's shot [75] 10 1: 9–27 kg Medium-sized dog [77] 10–30 kg A CRT computer monitor or television set [citation needed] 50 kg Large dog breed 70 kg Adult human [78] 10 2: 130–180 kg
Enjoy a classic game of Hearts and watch out for the Queen of Spades!
The total spin of the helium-4 nucleus is an integer (zero), making it a boson. The superfluid behavior is a manifestation of Bose–Einstein condensation, which occurs only in collections of bosons. It is theorized that at 0.2 K and 50 atm, solid helium-4 may be a superglass (an amorphous solid exhibiting superfluidity). [1] [2] [3]
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