# When to use Kelvin and Celsius?

#### ODorDO

##### Full Member
15+ Year Member
Hello everyone!

I have no idea when to use Kelvin or Celsius for temperature for some of the physics questions. thanks

#### mcgyver

##### Full Member
10+ Year Member
7+ Year Member
you almost always use kelvin.

Hello everyone!

I have no idea when to use Kelvin or Celsius for temperature for some of the physics questions. thanks

#### ODorDO

##### Full Member
15+ Year Member
dont thermal expansion and specific heat calculations both use celsius? or these 2 are the only exceptions?

#### JeetKuneDo

##### Full Member
10+ Year Member
I think anytime you deal with change in temp, you can use celcius or kelvin. But when in doubt, just go kelvin.

#### stockraider

##### Full Member
10+ Year Member
5+ Year Member
whenever you are dealing with a change in temp, it doesen't matter which one you use, for example the specific heat equation q=m*c*(change in temp). if you heat up something 100 degrees, it goes from 0 deg celcius to 100 deg celcius, converting to kelvin it goes from 273 K to 373 K, the difference is still 100 so either can be used in the equation.

#### ODorDO

##### Full Member
15+ Year Member
thanks! i guess the key is to watch out for the units

10+ Year Member
7+ Year Member

#### jturkel

##### Full Member
7+ Year Member
id only use kelvin when it's really freaking cold...like 0 kelvin.... i hear that ish is cold

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