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Academia - Collins - Pocket Scientific Dictionaries - Physics - English - French - Arabic Letter K


keeper
armature f d'aimant

Magnet case. The strength of the magnet can be maintained during storage by using a soft iron case to maintain a closed series of domains.


Kelvin scale
echelle f kelvin

Kelvin scale. One of the disadvantages of the Celsius (or Celsius) temperature scale is that it often has negative values.
As for the Kelvin scale (or absolute scale), it does not have negative values ​​because its zero is absolute zero. To convert the Celsius temperature to the Kelvin scale, you must add the number 273

Therefore, 0°C = 273 K
And 100° C = 373 K


kinetic energy
Energy in cinema

kinetic energy . The kinetic energy of a moving body is the work necessary to stop its motion. The value here depends on the body's mass m and its speed C, as follows:
W = 1/2 mc2, its unit is the joule

Thus, the kinetic energy of a spacecraft weighing 10 tons and rotating in orbit at a speed of 8 kilometers per second.
1/2 x 10 000 x (8000)2 joules = 320 gigajoules
The kinetic model of matter states that particles of matter are constantly moving, and therefore have kinetic energy. The temperature of a sample depends on the average energy of its particles.


kinetic model
Model m cinematique

Kinetic model. The most common picture of the structure of matter. There are four sayings that explain it:

A) All matter is composed of particles.
B) Particles are constantly moving.
C) Particles tend to attract each other.
D) Temperatures are related to the average energy of particles.
There is no direct proof of this theory. However, it is the only easy way to explain the behavior of matter.
See, for example, Brownian motion evapo, diffusion, convection, conduction, state, state, gas laws, expansion, ration vapor, and change.