HELIUM

HISTORY OF HELIUM

• Helium was discovered in 1868 by French Astronomer Pierre Janssen
• Was named Helium after the Greek God of the sun, Helios
• Was first thought to only exist in the sun
• Was discovered on Earth when Uranium minerals were treated with acids
• Was first observed in a solar eclipse when yellow spectral emission lines were seen

PROPERTIES OF HELIUM

• Helium is a noble gas, which means it has a full outer shell of electrons
• It is virtually unreactive
• Nontoxic, colorless, odorless gas that is less soluble in water than certain gas
• Condensation temperature is least of any known substances
• Has high thermal conductivity allowing for use in lighting.

USES OF HELIUM

• Used in balloons, weather to party balloons.
• Used in some "neon" lights.
• Used in extremely low temperature to achieve superconductivity state
• Used for helium-oxygen mixtures for divers
• Used as a shielding gas in welding

SOURCES

• Found in the atmosphere as other elements radioactively decay.
• Found in the pure form and used in the pure form
• In the pure form, helium costs $5.20 per 100g
• Is so unreactive, it is used to stabilize rocket fuel
• Found all around the world.

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