# What is the lowest possible temperature?

william1941 | College Teacher | (Level 3) Valedictorian

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The lowest possible temperature that can be physically achieved is called absolute zero. Using the third law of thermodynamics, entropy or the disorder in a substance reaches zero at absolute zero. It is also the temperature at which the volume of gases becomes zero. Absolute zero is only hypothetical with no possibility of our reaching it in reality, as no element remains a gas at temperatures as low as absolute zero. Only by using the quantum effects of matter can we reach a temperature that is very close to it.

On the Celsius scale absolute zero is -273 degree and on the Kelvin scale of temperature it is zero Kelvin.

kshitijthe123420 | Student, Undergraduate | (Level 1) eNoter

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The lowest possible temperature, or absolute zero as it is called, is −459.67 degrees Fahrenheit, or −273.15 degrees Celsius. It is also called 0 degrees Kelvin, a temperature scale with increments equivalent to degrees of Celsius, but uses absolute zero rather than water's freezing point as its starting point. The lowest possible temperature is defined as the point at which all atomic motion ceases. To achieve the lowest possible temperature, or true absolute zero, not only must atomic motion stop, but all of the atom's internal components would need to stop as well. Electrons would need to stop orbiting their respective atomic nuclei, the neutrons and protons in the nuclei would need to stop pulling each other around with their internal forces, the quarks, and any underlying substructure must cease all activity. Due to quantum mechanical effects, this is impossible.Like the efficiency of a system, the velocity of a particle, or the maximum possible temperature, absolute zero is actually a theoretical quantity which can only be approached, but never achieved. Temperatures near absolute zero have been achieved with the techniques of laser cooling and magnetic evaporative cooling. In laser cooling, fast-moving atoms are jostled with photons until they slow down to 1/10,000th of a degree Kelvin.

krishna-agrawala | College Teacher | (Level 3) Valedictorian

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Scientists believe that the lowest possible temperature that can be achieved is -273.15 degrees centigrade. This temperature, which is also called absolute zero, has been established on the basis of observation of relationship between temperature and pressure of a gas. When a given mass of gas contained in a fixed volume, its pressure decreases in direct proportion to its temperature. This phenomenon means that at the absolute zero temperature of all gases mus fall down to zero.

In the kelvin unit of measuring temperature, the absolute zero is taken is zero temperature. It is impossible to reach 0 degrees kelvin temperature. The lowest temperature so far reached in laboratories is of the order of 0.00001 degree kelvin.