Hot or cold is normal expression of temperature. We use different scales to measure temperature such as Celsius (°C), Fahrenheit (F) or Kelvin (K). In science, K is the most populous. Zero K is equivalent with -273.15 °C.
Scientifically, temperature is the a way to decribe the vibration extent of particles (molecules, atoms, ...). The frequency of vibration is proportional to temperature. It is said that at zero K the vibration is ceased. Nevertheless, this confirmation is not certain and there are no proof because scientist can not reach zero K in the laboratory. MIT Scientist reached nanokelvin (http://newsoffice.mit.edu/2003/cooling) for atoms. To attain this ultralow temperature, Scientists used "gravito-magnetic trap" to trap the atoms by the effect of gravitation forces and magnetic forces.
At low temperature, atom moves slowly (1 inch in 30 seconds). At room temperature, the atom move faster at jet airplane speed.
Can we get zero K to know if the movement of atom is ceased ?
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