Air - Specific Heat Ratio

Specific Heat Ratio of air at temperatures ranging -40 - 1000 degC (-40 - 1500 degF) at standard atmospheric pressure - Imperial and SI Units. The specific heat ratio (k) is the ratio of specific heat at constant pressure (cp) to specific heat at constant volume (cv).

Air - Specific Heat Ratio

Specific Heat Ratio of air at standard atmospheric pressure across a wide temperature range.

Definition:

k = cp / cv (ratio of specific heat at constant pressure to specific heat at constant volume)
Valid temperature range: -40°C to 1000°C (-40°F to 1500°F)

Select the unit system below to view the corresponding data table and chart.

Calculator

Inputs

Unit System

Results

Temperature (°C)	Specific Heat Ratio k
-40	1.401
-20	1.401
0	1.401
5	1.401
10	1.401
15	1.401
20	1.401
25	1.401
30	1.4
40	1.4
50	1.4
60	1.399
70	1.399
80	1.399
90	1.398
100	1.397
200	1.39
300	1.379
400	1.368
500	1.357
1000	1.321

Temperature (°F)	Specific Heat Ratio k
-40	1.401
-20	1.401
0	1.401
10	1.401
20	1.401
30	1.401
40	1.401
50	1.401
60	1.401
70	1.401
80	1.4
90	1.4
100	1.4
120	1.4
140	1.399
160	1.399
180	1.399
200	1.398
300	1.394
400	1.389
500	1.383
750	1.367
1000	1.351
1500	1.329