Standard sea-level conditions (SSL), also known as sea-level standard (SLS), defines a set of atmospheric conditions for physical calculations.
The term "standard
sea level
Mean sea level (MSL, often shortened to sea level) is an mean, average surface level of one or more among Earth's coastal Body of water, bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical ...
" is used to indicate that values of properties are to be taken to be the same as those standard at sea level, and is done to define values for use in general calculations.
Atmospheric properties
At SSL some atmospheric properties are:
*
Pressure
Pressure (symbol: ''p'' or ''P'') is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure (also spelled ''gage'' pressure)The preferred spelling varies by country and eve ...
, ''P'' = 101.325
kPa ⇔ 2116.2
lbf/
ft2 ⇔ 14.696
lbf/
in2 ⇔ 760
mmHg ⇔ 29.92
inHg
*
Density
Density (volumetric mass density or specific mass) is the ratio of a substance's mass to its volume. The symbol most often used for density is ''ρ'' (the lower case Greek letter rho), although the Latin letter ''D'' (or ''d'') can also be u ...
,
= 1.225 kg/m
3 ⇔ 0.002377
slug
Slug, or land slug, is a common name for any apparently shell-less Terrestrial mollusc, terrestrial gastropod mollusc. The word ''slug'' is also often used as part of the common name of any gastropod mollusc that has no shell, a very reduced ...
/ft
3
*
Temperature
Temperature is a physical quantity that quantitatively expresses the attribute of hotness or coldness. Temperature is measurement, measured with a thermometer. It reflects the average kinetic energy of the vibrating and colliding atoms making ...
, ''T'' = 15
°C ⇔ 59
°F ⇔ 288.15
K ⇔ 518.67
°R
*
Gas constant of air, ''R''
air = 287.057 J/(kg·K) ⇔ 1716.59 ft·lb/sl·°R)
*
Specific Weight,
= 12.014
N/
m3 ⇔ 0.07647
lbf/
ft3
*
Dynamic viscosity
Viscosity is a measure of a fluid's rate-dependent resistance to a change in shape or to movement of its neighboring portions relative to one another. For liquids, it corresponds to the informal concept of ''thickness''; for example, syrup h ...
,
= 1.789×10
−5 Pa·s ⇔ 3.737×10
−7 slug/(s·ft)
*
Acceleration of gravity, ''g
0'' = 9.807 m/s
2 ⇔ 32.174 ft/s
2
See also
*
Sea level
Mean sea level (MSL, often shortened to sea level) is an mean, average surface level of one or more among Earth's coastal Body of water, bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical ...
*
Sea level rise
The sea level has been rising from the end of the last ice age, which was around 20,000 years ago. Between 1901 and 2018, the average sea level rose by , with an increase of per year since the 1970s. This was faster than the sea level had e ...
*
Standard temperature and pressure
Standard temperature and pressure (STP) or standard conditions for temperature and pressure are various standard sets of conditions for experimental measurements used to allow comparisons to be made between different sets of data. The most used ...
*
U.S. Standard Atmosphere
References
Atmosphere
{{fluiddynamics-stub