(Replying to PARENT post)

If you want "twice as hot" to be meaningful, you have to use an absolute scale, either Kelvin or Rankine. (1 K = 1.8 °R) Doubling absolute temperature doubles the pressure (at constant volume) or volume (at constant pressure) of an ideal gas. This gets really important when it comes to compressing and expanding air and other gasses.

Room temperature is approximately 293 K, twice that is 586 K / 595 °F / 313 °C. Hotter than your typical oven cooking temperature.

We often don't realize how warm the world we live in truly is, from a physics standpoint.

👤mikewarot🕑2y🔼0🗨️0

(Replying to PARENT post)

Twice as hot is also useful in Celsius. For every increase of 10C chemical reactions happen twice as fast, it will literally, thermodynamically be twice as hot.

Which will probably even match your subjective feeling.

Celsius scales thermodynamically logarithmically. You can’t just double the numbers. (The same with sound etc.)

👤lynguist🕑2y🔼0🗨️0

(Replying to PARENT post)

You don't need an absolute scale, you just need a sensible origin. I suggest taking human perception into account.

When talking about the weather or everyday objects, one could argue that the border between "hot" and "cold" is somewhere at room temperature, so around 21°C. At that temperature, it's neither hot or cold. If it's 30°C, it's 9°C of "hotness", so 39°C would be twice as hot. I don't know if it feels twice as hot, as that's quite subjective, but if you want more precision we should switch to another vocabulary entirely.

👤mr_mitm🕑2y🔼0🗨️0

(Replying to PARENT post)

Kelvin doesn't use degrees
👤usui🕑2y🔼0🗨️0

(Replying to PARENT post)

> We often don't realize how warm the world we live in truly is, from a physics standpoint.

Or cold? There is a big ball in our solar system sitting at tens of millions of degrees K, and you think 273 degrees is warm?

👤aqme28🕑2y🔼0🗨️0

(Replying to PARENT post)

The Python package "pint" (to manage units) implements that with different units for absolute temperature vs delta temperatures.

https://pint.readthedocs.io/en/stable/user/nonmult.html

👤benhurmarcel🕑2y🔼0🗨️0

(Replying to PARENT post)

Dealing with any temperature difference requires an absolute scale as well.

The difference between 20°C and 25°C is 5K.

👤ginko🕑2y🔼0🗨️0