Star InactiveStar InactiveStar InactiveStar InactiveStar Inactive
 

The zero point on the absolute temperature scale, -273.15°C or 0 K, theoretically, the temperature at which molecular motion ceases. The concept of an absolute zero temperature was first deduced from experiments with gases. When a fixed volume of gas is cooled, its pressure decreases with its temperature. Absolute zero physically possesses quantum mechanical zero-point energy.

Absolute zero is equivalent to 0 °R on the Rankine scale and -459.67° on the Fahrenheit scale.

Absolute zero can't be reached through experiments, although it can be closely approached. Researchers have come close, but reaching absolute zero is not possible. The record for the coldest temperature of 0.45nK (billionths of a Kelvin) was recorded by MIT researchers in 2003. According to the third law of thermodynamics the entropy of a pure crystal is zero at absolute zero temperature.

Latest Articles

  • Why do copper products change color, and what is the name of the process?

    Probably, every person wants to know, why over time the copper turns green and becomes bloomed. This is easy to explain: that film is called patina.

  • Chemistry of the sky

    Chemistry can teach us about the composition of celestial bodies and determine their age.

  • Chemical Safety

    People use chemicals every day for a wide array of purposes, which can include work and house hold duties. Many of us fail to realize that we are actually handling potentially deadly chemicals when we simply clean the bathroom or wash the car. This brings to mind the reason why chemical safety is...

  • The most expensive metal in the world

    Do you think the most expensive metal is gold? No! On earth there are more valuable metals. But we need to divide the value of metals that occur in nature, and metals - isotopes, which are obtained in special laboratories. Let’s look at natural metals first.

  • Creating Malachite egg

    One of the most interesting and obvious chemical experiments is the experiment on the interaction of copper sulfate and calcium carbonate. The latter is contained in the shell of a simple egg, but copper sulphate should be searched in a chemical reagent store. This experience is simple, but...



Most Popular

Voltage

Potential difference between two electrodes, a measure of the chemical potential for a redox reaction to occur.

Cathode Ray Tube

Closed glass tube containing a gas under low pressure, with electrodes near the ends and a luminescent screen at the end near the positive electrode, produces cathode rays when high voltage is applied.

Metalloids

Elements with properties intermediate between metals and nonmetals: B, Al, Si, Ge, As, Sb, Te, Po, and At.

Specific Heat

The amount of heat required to raise the temperature of one gram of substance one degree Celsius.

Capillary

A tube having a very small inside diameter.

Basic Anhydride

The oxide of a metal that reacts with water to form a base.

Oxidation-reduction Reactions

Reactions in which oxidation and reduction occur, also called redox reactions.

Contact Process

Industrial process by which sulfur trioxide and sulfuric acid are produced from sulfur dioxide.

Quantum Mechanics

Mathematical method of treating particles on the basis of quantum theory, which assumes that energy (of small particles) is not infinitely divisible.

Colloid

A heterogeneous mixture in which solute-like particles do not settle out.