O2

What we inhale

O2 is the chemical formula for molecular oxygen—two oxygen atoms bonded together, forming the gas that makes up about 21 percent of Earth's atmosphere and sustains aerobic life.

In scientific and medical contexts, O2 appears in discussions of respiration, combustion, and blood oxygen levels: The patient's O2 saturation dropped below 90 percent.

molecule

diatomic

Having two atoms

gasFormless, expanding substance
respirationGas exchange in organisms
atmosphereGaseous layer around planets

air · breathable · photosynthesis · hemoglobin · lungs · aerobic · combustion · ozone · cellular · metabolism

sensor

pulse oximeter

Blood oxygen measuring device

saturationState of complete permeation
SpO2Peripheral oxygen saturation level
fingertipTerminal phalanx pad

monitoring · healthcare · vital signs · hypoxia · reading · percentage · probe · waveform · COVID · respiratory

brand

mobile

Capable of movement

networkInterconnected system
carrierOne that transports
cellularComposed of small units

telecommunications · UK · Germany · SIM · contract · 4G · 5G · broadband · tariff · roaming

arena

London

England's capital city

GreenwichLondon district, meridian origin
concertLive musical performance
venuePlace of occurrence

stadium · entertainment · events · basketball · ice hockey · capacity · seating · performances · exhibitions · live music

Categories

Chemical FormulasH2O, CO2, NaCl, N2, H2
gasesgas, air, helium, nitrogen, hydrogen
telecomwireless, cellular, telecommunications, carriers, telephone
cell phone serviceVerizon, AT&T, T-Mobile, Sprint, Vodafone
Oxygenozone, LOX, oxidizer, hypoxia, hypoxic
TelecomsAT&T, Vodafone, Verizon, T-Mobile, Sprint

Opposites

respiratory gases

Carbon dioxide formula

carbon dioxide · CO · carbon monoxide · nitrogen · N2

biological necessity

Harmful ingested substance

toxin · asphyxiant · cyanide · CO · carbon monoxide

UK mobile network branding

Mobile phone network provider

EE · Virgin Mobile

Family

oxygen, oxygenate, oxygenation, oxygenated, deoxygenate, deoxygenated, deoxygenation, oxide, oxidize

Familiarity: Top 200,000
Profile: Known to kids · Used worldwide · Timeless · Concrete · Rated G