helium-4
Alpha particle core
Helium-4 is the most common isotope of helium, with two protons and two neutrons in its nucleus.
It accounts for nearly all helium found in nature.
At extremely low temperatures, helium-4 becomes a superfluid—flowing without friction and exhibiting quantum effects visible at macroscopic scales.
Having no resistance
- viscosityFluid's flow resistance
- cryogenicsUltralow temperature science
- vortexRotating fluid column
- creepingMoving slowly, stealthily
Central controlling part
- protonPositive nuclear particle
- neutronUncharged nuclear particle
- nuclideAtom classified by nucleus
- nucleonProton or neutron
deuterium · tritium · hydrogen · half-life · spin · boson · fermion · abundance
Inactive, physically or chemically
- nonreactiveChemically inactive substance
- argonUnreactive element eighteen
- neonInert illuminating element
- kryptonInert gas, atomic thirty-six
xenon · radon · valence · monatomic · colorless · odorless · unreactive · chemistry
Losing thermal energy
- superconductorMaterial with zero electrical resistance
- MRIMagnetic body imaging
- liquefactionConversion to liquid state
- coolantTemperature-regulating fluid
frictionless
Having no resistance
- viscosityFluid's flow resistance
- cryogenicsUltralow temperature science
- vortexRotating fluid column
nucleus
Central controlling part
nucleon · deuterium · tritium · hydrogen · half-life · spin · boson · fermion · abundance
inert
Inactive, physically or chemically
- nonreactiveChemically inactive substance
- argonUnreactive element eighteen
- neonInert illuminating element
krypton · xenon · radon · valence · monatomic · colorless · odorless · unreactive · chemistry
cooling
Losing thermal energy
- superconductorMaterial with zero electrical resistance
- MRIMagnetic body imaging
- liquefactionConversion to liquid state
coolant · low-temperature · laboratory · magnetometry · cryostat
- nuclear physicsnuclear energy, fission, nuclear fission, neutron, proton
- cryogenicsliquid nitrogen, cryogenic, cryogenics, cryogenic storage, cryostat
- Isotopescarbon-12, carbon-13, carbon-14, hydrogen-1, oxygen-16
- Tracerstechnetium-99m, fluorescein, tritium, carbon-14, iodine-131
- Fusion Energyfusion power, fusion reactors, nuclear fusion, thermonuclear fusion, fusion reaction
- Bosonsphoton, gluon, Higgs boson, W boson, meson
helium-4helium-3
Light noble gas variant
hydrogen-1 · uranium-238 · protium · heavy elements · superheavy elements
- helium balloonGas-filled floating sphere
- helium tankVessel holding noble gas
- helium gasLightest noble element
- helium speechGas-altered vocal pitch
- liquid heliumSupercooled element in fluid state