How do they know that -273 Celcius is as cold as it gets?

Question

It would not really be possible to reach if that was the coldest, because most things would freeze up before you get there. 'Splain.

What would happen if we got -10 Kelvin? How would we measure it?

Answer 1

Anyone thinking that hasn't spent any time at my place.

Absolute Zero is how cold it is when hydrogen atoms stop moving.

Anything colder than that is the area in and around my bed immediately after I ask my wife for sex.

Answer 2

The -273 celcius is based on mathematical equations since it is (which you are right) impossible for us to create an object at 0kelvin

Scientists simply measure how much knetic energy an atom loses as temperature decreases observe this from various temperatures until they get a pattern. Once they get their reconizable pattern, they can assume what temperature the atom completly stop moving which is zero kelvin.

Why can you go below 0 kelvin? Lol i asked the same question once.
Temperature measures how much an atom is moving. The faster atoms vibrate, the hotter it becomes. When the atom isnt moving at ALL, it reaches 0 kelvin. This is why -10 kelvin is impossible casue you cant be more still than perfectly nonmoving matter.

Answer 3

I'm not completely sure about this answer, but here goes:

-273 C is equal to 0 Kelvin, the SI unit of temperature. 0 Kelvin has never been reached in any laboratory experiment. The closest they have come was with liquid nitrogen, but it was a couple degrees Kelvin off of 0.

In the future, who knows? 0 K may be reached. But for now, with our current technology, we cannot. 0 K is kind of a theoretical temperature anyway, never attained in a laboratory experiment, as I said above. It's just used for experimental calculations and as a "goal" for groundbreaking chemists.

Answer 4

The Xenmas answer nails it.
Experiments as low as 0.4 kelvin can be done routinely. It is accomplished in a special chamber that can achieve 10K and the remainder of the cooling is done by evaporating liquid helium (as your hand cools when gasoline evaporates). The temperature is recorded using specially calibrated thermocouples as well as through studying what little vibrational modes are available and showing on a reference compound that is well defined. Regardless of the potential inaccuracies at this low temperature, the temperature drop approaches 0K and doesn't reach it in quite remarkable to the pressure versus T relationship determined in the 1500s

Answer 5

First of all there no such thing as -10K, 0K is meant to be the coolest thing thing possible if it was possible all it would mean is that 0K would have a new C value.

There have been some studies to see how low one can go.
These involvecooling by using lasers, what they found that very very near 0K that atoms lose there enegry and start to to medge into one. As atom movement related is with heat, hence if an atom stops vibiating, moving no heat can be possible.

I also read http://www.redorbit.com/news/stories/2/2003/09/12/story001.html

Answer 6

It's just a theory that when things get cold enough (zero degrees kelvin), their mollecules will just completely stop moving. We have never gotten anything to reach absolute zero, but we have, by means of experiments, gotten very close. Mollecules in substances DO slow down as temperatures drop, and so the theory is that they would have to stop sometime....and you cluldn't really stop them anymore once you get there, could you?

Answer 7

It can be proven using experimental data.

If you take a gas pressure (y-axis) vs. temperature graph (x-axis), you will end up with a straight line slanting upward to the right. If you keep extending the graph, until the line hits 0 (y=0), the temperature will read -273 C.

Answer 8

-273 C means 0K which is absolute zero> At this temperature the atoms stop moving.
No one or no substance has ever experienced -273C temperature. Scientists have calculated the speed and the kinetic energy of different kinds of molecules at different temperatures. They plot their data and find the existing trends. They extend this trend to get hypothetical points. This is called extrapolation. Extrapolation of many different data showed that the atom speed goes to 0C at approximately -273C or 0K.

Answer 9

-10 kelvin can't happen because at 0 kelvin the part of the atom stop moving. everything falls apart.

Answer 10

the thing with -273 celcius is the fact its not THE COLDEST EVER, its just the point where atoms stop moving

wait, i wasnt completly right... here