Definitions - k

K Value

The comparison of thermal conductivity can be measured by the 'k' value. The k value, or Thermal Conductivity, specifies the rate of heat transfer in any homogeneous material. If a material has a k value of 1, it means a 1m cube of material will transfer heat at a rate of 1 watt for every degree of temperature difference between opposite faces. The k value is expressed as 1 W/mK. The lower this value is, the less heat the material will transfer.

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K-Selection

Species in stable environments tend to live longer and produce fewer, and sometimes larger, offspring. (K is the constant for carrying capacity in terms of population growth.) This used to be true for whales before their environment was changed. See R-Selection.

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Kapok

Kapok trees produce a fluffy fiber in their seed pods. The kapok fiber is a substitute for down.

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Katabatic Wind

Any wind blowing downslope. Usually cold.

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Kelp

Underwater forests of tall brown algae that grow in cool coastal waters.

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Kerbside Recycling System

Where people sort out their recyclable waste, either into a box, bag or separate bin, and this is then collected from people's houses, like the ordinary waste collection.

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Kettle Hole

Depression or pond found in glacial deposits (see Kame Terrace). Left by a chunk of melted glacier.

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Kilowatt-Hour

(kWh) 1,000 thousand watts acting over a period of 1 hour. The kWh is a unit of energy. 1 kWh=3600 kJ.

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Kyoto Protocol

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