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Inelastic Demand
A term used when the percentage change in quantity demanded is smaller than the percentage change in price.
Infiltration
The movement of water into soil, a portion of which is evaporated or transpired (evapotranspiration), a portion of which may move to surface streams (interflow), and a portion of which moves downward to the saturated zone (recharge).
Infiltration capacity
The maximum rate at which the soil, when in a given condition, can absorb falling rain or melting snow.
Infiltration index
An average rate of infiltration, in inches per hour, equal to the average rate of rainfall such that the volume of rain fall at greater rates equals the total direct runoff.
Inflation
Increase in the overall level of prices over an extended period of time.
Infrared radiation
The heat energy that is emitted from all solids, liquids, and gases. In the context of the greenhouse issue, the term refers to the heat energy emitted by the Earth's surface and its atmosphere. Greenhouse gases strongly absorb this radiation in the Earth's atmosphere, and radiate some back towards the surface, creating the greenhouse effect. See radiation, greenhouse effect, enhanced greenhouse effect, global warming.
Inorganic compound
Combination of two or more elements other than those used to form organic compounds. See organic compound.
Inorganic fertilizer
See synthetic fertilizer.
Insecticide
A pesticide used to kill, deter, or control insects.
Instream use
Water that is used in, but not withdrawn from, surface waters for such purposes as hydroelectric-power generation, navigation, water-quality improvement, fish propagation, wildlife, habitat, and recreation. Sometimes called non-withdrawal use or in-channel use.

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