0 Kelvin?

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