|
gptkbp:instance_of
|
gptkb:isotope
|
|
gptkbp:abundance_in_earth
|
trace amounts in the atmosphere
|
|
gptkbp:abundance_in_sun
|
about 25% of the Sun's mass
|
|
gptkbp:aroma
|
odorless
|
|
gptkbp:can_exist_as
|
gptkb:natural_gas
gptkb:liquid
|
|
gptkbp:clinical_use
|
MRI contrast agent
|
|
gptkbp:color
|
colorless
|
|
gptkbp:cooling_system
|
0.1513 W/(m· K)
5.193 k J/(kg· K)
|
|
gptkbp:critical_density
|
0.125 g/cm³
|
|
gptkbp:critical_pressure
|
2.24 MPa
|
|
gptkbp:critical_temperature
|
-267.96 ° C
|
|
gptkbp:discovered_by
|
gptkb:William_Ramsay
|
|
gptkbp:discovery_year
|
1895
|
|
gptkbp:dissolved
|
insoluble
|
|
gptkbp:educational_use
|
demonstrations of gas laws
|
|
gptkbp:electronegativity
|
gptkb:N/_A
|
|
gptkbp:electrons
|
2
|
|
gptkbp:engine
|
leak detection
|
|
gptkbp:financial_stability
|
gptkb:stable
|
|
gptkbp:formed
|
from hydrogen fusion
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Helium-4
|
|
gptkbp:is_a
|
gptkb:isotope
|
|
gptkbp:is_a_fusion_of
|
occurs in stars
|
|
gptkbp:is_found_in
|
gptkb:natural_gas
|
|
gptkbp:is_used_in
|
cryogenics
|
|
gptkbp:isotopes
|
gptkb:Dog
2
|
|
gptkbp:isotopic_composition
|
2 protons, 2 neutrons
|
|
gptkbp:liquid_density
|
0.125 g/cm³
|
|
gptkbp:liquid_specific_heat_capacity
|
5.193 k J/(kg· K)
|
|
gptkbp:liquid_thermal_conductivity
|
0.152 W/(m· K)
|
|
gptkbp:mass
|
gptkb:4
|
|
gptkbp:melting_point
|
-268.93 ° C
-272.2 ° C
|
|
gptkbp:number_of_rooms
|
0.0001 mm Hg at 0 ° C
|
|
gptkbp:occurs_in
|
abundant in the universe
|
|
gptkbp:population_density
|
0.1786 g/ L
|
|
gptkbp:power_source
|
24.587 e V
|
|
gptkbp:roll_rate
|
gptkb:0
|
|
gptkbp:safety
|
non-toxic
non-flammable
asphyxiation risk in high concentrations
|
|
gptkbp:species
|
99.99986% in natural helium
|
|
gptkbp:symbol
|
He
|
|
gptkbp:taste
|
tasteless
|
|
gptkbp:uses
|
gptkb:Dog
cryogenics
inert gas for welding
cooling superconducting magnets
|
|
gptkbp:uses_in_aerospace
|
pressurizing fuel tanks
|
|
gptkbp:uses_in_entertainment
|
party balloons
|
|
gptkbp:uses_in_science
|
cryogenic research
|
|
gptkbp:viscosity_grade
|
0.019 m Pa·s
|
|
gptkbp:was_a_response_to
|
produced in stellar nucleosynthesis
produced in alpha decay
|
|
gptkbp:bfsParent
|
gptkb:Superfluidity
|
|
gptkbp:bfsLayer
|
5
|