International Standard Atmosphere

Reference data and engineering information about international standard atmosphere for basics applications.

internationalstandardatmosphere

Overview

Engineering reference data for International Standard Atmosphere in basics.

Key Formulas

Ohm's Law

$V = IR$

Voltage = Current × Resistance.

Newton's Second Law

$F = ma$

Force = mass × acceleration.

Conservation of Energy

$E_{in} = E_{out} + \Delta E_{stored}$

Energy balance.

Variables

Symbol	Description	Unit
$V$	Voltage	V
$I$	Current	A
$R$	Resistance	Ω
$F$	Force	N
$m$	Mass	kg
$a$	Acceleration	m/s²

ISA Standard Conditions

The International Standard Atmosphere (ISA) defines a reference atmosphere based on the following sea-level conditions:

Property	Value	Unit
Temperature	288.15	K (15°C)
Pressure	1.01325	bar
Density	1.2250	kg/m³
Speed of Sound	340.3	m/s

Atmospheric Properties Table

43 rows

International Standard Atmosphere properties at various elevations
Elevation(m)	Temperature(K)	Pressure(bar)	Relative Density(ρ/ρ₀)	Kinematic Viscosity(×10⁻⁵ m²/s)	Thermal Conductivity(×10⁻² W/(m·K))	Speed of Sound(m/s)
-2000	301.2	1.2778	1.2067	1.253	2.636	347.9
-1500	297.9	1.207	1.1522	1.301	2.611	346
-1000	294.7	1.1393	1.0996	1.352	2.585	344.1
-500	291.4	1.0748	1.0489	1.405	2.56	342.2
0	288.15	1.01325	1	1.461	2.534	340.3
500	284.9	0.9546	0.9529	1.52	2.509	338.4
1000	281.7	0.8988	0.9075	1.581	2.483	336.4
1500	278.4	0.8456	0.8638	1.646	2.457	334.5
2000	275.2	0.795	0.8217	1.715	2.431	332.5
2500	271.9	0.7469	0.7812	1.787	2.405	330.6
3000	268.7	0.7012	0.7423	1.863	2.379	328.6
3500	265.4	0.6578	0.7048	1.943	2.353	326.6
4000	262.2	0.6166	0.6689	2.028	2.327	324.6
4500	258.9	0.5775	0.6343	2.117	2.301	322.6
5000	255.7	0.5405	0.6012	2.211	2.275	320.5
5500	252.4	0.5054	0.5694	2.311	2.248	318.5
6000	249.2	0.4722	0.5389	2.416	2.222	316.5
6500	245.9	0.4408	0.5096	2.528	2.195	314.4
7000	242.7	0.4111	0.4817	2.646	2.169	312.3
7500	239.5	0.383	0.4549	2.771	2.142	310.2
8000	236.2	0.3565	0.4292	2.904	2.115	308.1
8500	233	0.3315	0.4047	3.046	2.088	306
9000	229.7	0.308	0.3813	3.196	2.061	303.8
9500	226.5	0.2858	0.3589	3.355	2.034	301.7
10000	223.3	0.265	0.3376	3.525	2.007	299.8
10500	220	0.2454	0.3172	3.706	1.98	297.4
11000	216.8	0.227	0.2978	3.899	1.953	295.2
11500	216.7	0.2098	0.2755	4.213	1.952	295.1
12000	216.7	0.194	0.2546	4.557	1.952	295.1
12500	216.7	0.1793	0.2354	4.93	1.952	295.1
13000	216.7	0.1658	0.2176	5.333	1.952	295.1
13500	216.7	0.1533	0.2012	5.768	1.952	295.1
14000	216.7	0.1417	0.186	6.239	1.952	295.1
14500	216.7	0.131	0.172	6.749	1.952	295.1
15000	216.7	0.1211	0.159	7.3	1.952	295.1
15500	216.7	0.112	0.147	7.895	1.952	295.1
16000	216.7	0.1035	0.1359	8.54	1.952	295.1
16500	216.7	0.09572	0.1256	9.237	1.952	295.1
17000	216.7	0.0885	0.1162	9.99	1.952	295.1
17500	216.7	0.08182	0.1074	10.805	1.952	295.1
18000	216.7	0.07565	0.0993	11.686	1.952	295.1
18500	216.7	0.06995	0.09182	12.639	1.952	295.1
19000	216.7	0.06467	0.08494	13.667	1.952	295.1

Source: engineeringtoolbox.com

Interactive Charts

Atmospheric elevation - pressure, temperature and speed of sound at different altitudes

References

Original Source

Source: engineeringtoolbox.com