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.Search the Web for K Value
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.Search the Web for K-Selection
Kapok trees produce a fluffy fiber in their seed pods. The kapok fiber is a substitute for down.Search the Web for Kapok
Any wind blowing downslope. Usually cold.Search the Web for Katabatic Wind
Underwater forests of tall brown algae that grow in cool coastal waters.Search the Web for Kelp
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.Search the Web for Kerbside Recycling System
Depression or pond found in glacial deposits (see Kame Terrace). Left by a chunk of melted glacier.Search the Web for Kettle Hole
Carbon is the chemical element with symbol C and atomic
number 6. As a member of group 14 on the periodic table, it is nonmetallic
and tetravalent—making four electrons available to
form covalent chemical
bonds. There are three naturally occurring isotopes, with 12C
being stable, while 14C is radioactive, decaying with a half-life
of about 5730 years.
Carbon is one of the few
elements known since antiquity.
The name "carbon" comes from Latin language carbo, coal.
See the full entry on wikipedia
International treaty whose aim is to stem global warming, signed in 1997 following negotiations within the U.N.
In December 1997, around 180 nations signed a treaty in Japan, under which 38 industrialized countries committed themselves to reducing emissions of the six greenhouse gases blamed for global warming. The Kyoto Protocol stipulates that, between 2008 and 2012, these emissions should be decreased to an average level 5.2% lower than that of 1990.