Variation of atmospheric pressure & temperature with altitude

DESIGN INTEGRITY

USEFUL DESIGN DATA

Convection Cooled ATR Spec

Conduction Cooled ATR Spec

Standard ATR Dimensions

Typical ATR Weights

Mechanical Fragility Factors

Pressure/Temp Variations

Thermal Management

PROBLEM SOLVING INNOVATIONS

Photo courtesy of Aerosystems International

Many of Elma-Mektron’s system enclosures are destined for operation in a wide variety of airborne applications.

Listed below is a useful guide to the actual figures that demonstrate the variation of atmospheric air pressure and temperature at various altitudes.

PRESSURE/TEMPERATURE VARIATIONS

ALTITUDE
Feet	Metres
–820	–250
0	0
820	250
1,640	500
2,461	750
3,281	1,000
4,921	1,500
6,562	2,000
8,202	2,500
9,843	3,000
11,483	3,500
13,123	4,000
16,404	5,000
19,685	6,000
22,966	7,000
26,247	8,000
29,528	9,000
32,808	10,000
49,213	15,000
65,617	20,000
82,021	25,000
98,415	30,000
104,987	32,000

AIR PRESSURE
mbar	PA
1,030	104,365
1,000	101,325
971	98,358
942	95,461
914	92,635
887	89,876
835	84,560
785	79,501
737	74,692
692	70,121
649	65,780
609	61,660
533	54,048
466	47,218
406	41,105
352	35,652
304	30,801
262	26,500
120	12,112
55	5,529
26	2,594
12	1,197
9	889

TEMPERATURE
Deg °C	Deg °F
17	62
15	59
13	56
12	53
10	50
9	47
5	41
2	36
-1	30
–4	24
–8	18
–11	12
–17	1
–24	–11
–30	–23
–37	–34
–43	–46
–50	–58
–57	–70
–57	-70
–52	–61
–47	–52
–45	–48

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Email: info@elma-mektron.co.uk