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Kappa number
  A test for the degree of lignification of pulps.
 
Key
  A small, parallel-sided piece, flat or tapered on top, for securing pulleys and other parts to shafts.
 
Keyway
  A groove or channel for a key, as in a shaft or the hub of a pulley; a keyseat.
 
Kilogram (kg)
  The basic unit of mass in the SI system, equal to 1,000 grams (approximately 2.2 lbs).
 
Kilometre (km)
  A measure of length equal to 1,000 metres or 0.62 miles.
 
Kilowatt (kW)
  A measure of electrical power equal to 1,000 watts. 1 kW = 3,413 Btu/hr = 1.341 horsepower.
 
Kilowatt hour (kWh)
  A measure of energy equivalent to the expenditure of one kilowatt for one hour. For example, 1 kWh will light a 100-watt light bulb for 10 hours. 1 kWh = 3,413 Btu.
 
Kinetic energy
  Energy that a substance or body has by virtue of its mass (weight) and velocity.
 
Knuckleboom
  A hydraulically operated loading boom whose mechanical action imitates the human arm. Common on "forwarders".
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