# Air Heat Capacity (Chemistry) **URL:** \ **Category:** Factual Questions\ **Created:** [April 12, 2005, 2:52am UTC](https://boards.straightdope.com/t/air-heat-capacity-chemistry/298912 "2005-04-12T02:52:26Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Cloud](https://avatars.discourse-cdn.com/v4/letter/c/e99b99/32.png) [@Cloud](https://boards.straightdope.com/u/Cloud)\ **Post date:** [April 12, 2005, 2:52am UTC](https://boards.straightdope.com/t/air-heat-capacity-chemistry/298912/1 "2005-04-12T02:52:26Z")
I am looking for the specific heat capacity of air, however after searching all I can find is the heat capacity in J per kilograms degrees celsius and that value is 1.0 x 10^3. Question 1: Is that the correct value for the specific heat capacity of water? Question 2: I know I can easily use the kg value, but how would I convert the kg to g? Thank you everyone! 🙂 ---
**Author:** ![Squink](https://avatars.discourse-cdn.com/v4/letter/s/b5e925/32.png) [@Squink](https://boards.straightdope.com/u/Squink)\ **Post date:** [April 12, 2005, 3:37am UTC](https://boards.straightdope.com/t/air-heat-capacity-chemistry/298912/2 "2005-04-12T03:37:37Z")
Your heat capacity number is right for dry air, but [things change when it gets humid.](http://amsglossary.allenpress.com/glossary/search?id=specific-heat-capacity1) Your 1000 J/kg°C converts to 1.0 J/gm°C. Just in case you need it: Air at STP (0°C, 760 torr) has a density of 1.293 kg/m[sup]3[/sup]. 1 cubic meter is 1000 liters, which at STP, holds 44.64 moles of gas.