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| Helium, He » |
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| HELIUM |
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Name:
Symbol:
Atomic number:
Molecular weight:
Group number:
Group name:
Period number:
CAS Registry ID:
UN Number(gas):
UN Number(liquid):
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Helium
He
2
4.0026 g/mol
18
Rare gas
2
7440-59-7
UN1046
UN1963 |
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Helium (Greek helios meaning "the sun")
was isolated by Sir William Ramsay in 1895, from clevite and conclusively
found not to be a metal, but the name was unchanged. Helium occurs
in economically extractable amounts in certain natural gases and
is used as a lifting gas for balloons and blimps, as a cryogenic
cooling liquid for super- conducting magnets and as a filler gas
for deep-sea diving.
Typical Level of Impurities
| Neon |
Ne |
ppm |
4,0 |
| Nirogen |
N2 |
ppm |
1,0 |
| Oxygen |
O2 |
ppm |
1,0 |
| Carbon oxides |
CO+CO2 |
ppm |
1,0 |
| Moisture |
H20 |
ppm |
1,0 |
HELIUM Liquid Purity 99,9995 |
He |
% |
ppm |
| Neon |
Ne |
ppm |
1,5 |
| Nirogen |
N2 |
ppm |
1,5 |
| Oxygen+Argon |
O2+Ar |
ppm |
0,5 |
| Carbonoxides+Moisture |
CO+CO2+H20 |
ppm |
1,0 |
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m3
gas
15°C; 1bar |
ltr.
liquid
TS 1,013 bar |
kg |
| m3 |
1 |
1,336 |
0,1670 |
| ltr. |
0,7485 |
1 |
0,1250 |
| kg |
0,5988 |
8,00 |
1 |
Physical constants
| Chemical Formula |
He |
| Molecular weight |
4,0026 |
| Denseness of gas at + 20"C |
0,166 Kg/m3 |
| Denseness of gas at + 0"C |
0,17846 kg/m3 |
| Temperature of boiling |
-268,8"C (4,2"K) |
| Denseness of a liquid |
125 kg/m3 |
| Bottlenecks: |
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| Temperature |
-267,8"C (5,2"K) |
| Pressure |
2,26 technical atmosphere |
| Denseness |
69,3 Kg/m3 |
Information about cylinders
| Type of cylinder |
Bulk, ltr. |
Type of a valves |
Operating pressures, bar |
Net weight, kg |
Amount, ltr. |
| B50 |
50 |
DIN 477/6 |
140 |
8,28 |
10.000 |
Transport data
| Chemical Symbol |
He |
| CAS Registry ID |
7440-59-7 |
| DOT Classification |
Non-inflammable gas |
| DOT Label |
Non-inflammable gas |
| Hazard class |
2.2 |
| UN Number |
UN 1046 |
| Main Dangers High |
High Pressure and asthma |
| Toxility (TLV) |
Non-toxic gas (asthma) |
| Range of Flammability (in an air) |
Non-inflammable gas |
| Odor |
Without an odor |
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| Xenon, Xe » |
| Krypton, Kr » |
| Neon, Ne » |
| Argon, Ar » |
| Laser Gas, XeNe » |
| Laser Gas, KrNe » |
| Laser Gas, ArXeNe » |
| Laser Gas, NeH2 » |
Excimer Laser Gases
XeCl, XeF, ArF, KrF » |
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