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Hydrogen: Colourless, tasteless,
odourless and highly inflammable gas, the lightest element.
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Hydrocarbon: Compounds of hydrogen and
carbon.
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Hydrophobia: Fear of water, Important
symptom of the Fatal disease Rabies.
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Hydroponics: Cultivation of plants by
planting the roots in nutrient solutions rather than in soil.
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Hydrosphere: Water bodies on earth's
surface constitute hydrosphere.
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Hydrolysis: Chemical
reaction of substance with water.
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Hydrogenation: Chemical
reaction of a substance with hydrogen, Chemical reduction.
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Hydrocephalus: Accumulation of
fluids in the brain.
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Hydrology: The Study of
water with reference to its occurrence and atmosphere.
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Hydropathy: Curing a disease by
internal and external use of water.
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Hydrostatics: Mathematical
study of forces and pressure in stationary liquids.
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Hydrodynamics: Mathematical
study of forces and pressure in liquids in motion.
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Hydro Metallurgy : Process of
extraction of metals by leaching the ore with water. Also called
levitation.
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Hyrosol: Colloid in which water
acts as the dispersion medium.
