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Liquid helium is a physical state of helium at very low temperatures at standard atmospheric pressures.Liquid helium may show superfluidity.. At standard pressure, the chemical element helium exists in a liquid form only at the extremely low temperature of −269 °C (−452.20 °F; 4.15 K).
The series is told through Minecraft and is designed for educational use in classrooms. [7] American author Jordan Shapiro praised the show for demonstrating the educational potential of Minecraft. [21] Garrett, upon being asked if he would be interested in transitioning to television, stated that he was happy remaining on YouTube. [22]
Helium atom 3.1 × 10 −11 meters 2.5 × 10 −11 meters Hydrogen atom ... Minecraft world — 6.4 × 10 7 meters Gliese 229 B: 1.1 × 10 8 meters 1.1 × 10 8 meters ...
The symbol 4.1 H (Hydrogen-4.1) has been used to describe the exotic atom muonic helium (4 He-μ), which is like helium-4 in having two protons and two neutrons. [5] However one of its electrons is replaced by a muon, which also has charge –1.
Hydrogen and helium are the most commonly used lift gases. Although helium is twice as heavy as (diatomic) hydrogen, they are both significantly lighter than air. Thus helium is almost twice as dense as hydrogen. The lifting power in air of hydrogen and helium can be calculated using the theory of buoyancy.
A chart or table of nuclides maps the nuclear, or radioactive, behavior of nuclides, as it distinguishes the isotopes of an element.It contrasts with a periodic table, which only maps their chemical behavior, since isotopes (nuclides that are variants of the same element) do not differ chemically to any significant degree, with the exception of hydrogen.
Helium (from Greek: ἥλιος, romanized: helios, lit. 'sun') is a chemical element; it has symbol He and atomic number 2. It is a colorless, odorless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table.
Materials on the Moon's surface contain helium-3 at concentrations estimated between 1.4 and 15 parts per billion (ppb) in sunlit areas, [1] [63] [64] and may contain concentrations as much as 50 ppb in permanently shadowed regions. [65] For comparison, helium-3 in the Earth's atmosphere occurs at 7.2 parts per trillion (ppt).
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