Absolute zero, temperature at which a thermodynamic system has the lowest energy. It corresponds to −273.15 °C on the Celsius temperature scale and to −459.67 °F on the Fahrenheit temperature scale.

Nothing can be cooled to a temperature of exactly absolute zero. The temperature of an object is a measure of the average random motion energy (kinetic energy) of its atoms. Absolute zero is the temperature at which all of an object’s atoms have been brought to a dead stop relative to each other.

Answer 2: The closest to absolute zero anyone has reached is around 150 nano Kelvin. The group ended up receiving the 1997 Nobel Prize in Physics for it. They got the prize because they ended up proving a theory called Bose-Einstein Condensation which had been made decades before it was proven.

To Kelvin’s mind, absolute zero was where a temperature scale should begin, but for convenience, he used the markers and intervals of the widely-known Celsius scale as a base for his own. As such, in the Kelvin scale, water freezes at 273.15 K (0 C) and boils at 373.15 K, or 100 C.

In 1848, William Thomson, who was later ennobled as Lord Kelvin, wrote in his paper On an Absolute Thermometric Scale of the need for a scale whereby “infinite cold” (absolute zero) was the scale’s null point, and which used the degree Celsius for its unit increment.

So in the shade in space a dead person would freeze…. If you were initially alive your metabolic heat and added work burning calories would stretch this out a couple of hours before hypothermia set in. After you die then it would take 10.59 hours.

Normal core body temperature is 98.6 degrees Fahrenheit (37º Celcius), and mild hypothermia sets in at about 95 degrees F (35º C). Below 70º F (21,1º C), you are said to have profound hypothermia and death can occur, Sawka said.

That’s called hypothermia and it’s a real danger. Death can happen faster if you fall through ice into freezing water below. Watch first for frostbite. It only takes 5 to 10 minutes in freezing temperatures with a wind chill factor.

Signs and symptoms of hypothermia include: Shivering. Slurred speech or mumbling. Slow, shallow breathing.

Expected Survival Time in Cold Water

Hypothermia can occur when you are exposed to cold air, water, wind, or rain. Your body temperature can drop to a low level at temperatures of 50°F (10°C) or higher in wet and windy weather, or if you are in 60°F (16°C) to 70°F (21°C) water.

70F(21C) Water feels quite cold to most people. Treat any water temperature below 70F (21C) with caution. 40F(4.4C) or lower Water is painfully cold.