0 Kelvin?

[nsws1988]

Why can't we lower the temperature below zero K?

The whole world would freeze up and we'd all die &

[afridi220]

The whole world would freeze up and we'd all die &

You are not going to freez sun

[sarah2505]

Why can't we lower the temperature below zero K?

First question Munzir,
what is temperature?
Is it a measure of heat, or a measure of heat and/or cold?

[Rev_John]

It is simply that 0 Kelvin is the absence of all heat. So nothing can get colder.

[sarah2505]

It is simply that 0 Kelvin is the absence of all heat. So nothing can get colder.

exactly, 'cold' = absence of heat
when heat gets to '0', the temperature is 0 K as all molecular motion stops.
You can't get a slower molecular speed of vibration/movement than 0

[Rev_John]

exactly, 'cold' = absence of heat
when heat gets to '0', the temperature is 0 K as all molecular motion stops.
You can't get a slower molecular speed of vibration/movement than 0

Just the same as dark = absence of light

Position = absence of volocity

etc

[nsws1988]

It is simply that 0 Kelvin is the absence of all heat. So nothing can get colder.

aha !

[sarah2505]

Just the same as dark = absence of light

Position = absence of volocity

etc

well, position and velocity are a little complicated, since you have to fix a frame of reference,
you could sit still in a train going at 60km/h

[Rev_John]

well, position and velocity are a little complicated, since you have to fix a frame of reference,
you could sit still in a train going at 60km/h

That is true, it is all relative. Also both position and velocity do exist and can be measured just not at the same time. Whereas dark and cold do not

[sarah2505]

That is true, it is all relative. Also both position and velocity do exist and can be measured just not at the same time. Whereas dark and cold do not

exactly, temperature, light intensity are both scalars, whereas velocity is a vector, hence the need for a frame of reference

[Rev_John]

exactly, temperature, light intensity are both scalars, whereas velocity is a vector, hence the need for a frame of reference

Thank you for that. I wasn't thinking when I included velocity

[sarah2505]

I hope this answers your question, Munzir

[MUNZIR_ALI]

It is simply that 0 Kelvin is the absence of all heat. So nothing can get colder.

Thanks.

[Rev_John]

Thanks.

You are always welcome