The SI-system, unit converters, physical constants, drawing scales and more.ĭensities of solids, liquids and gases. Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content. = (10 m 3 ) (9.81 m/s 2 )į l = lifting force - change in gravity force (weight) (N)Ī g = acceleration of gravity (9.81 m/s 2 )ĭm = V d ρ = change of mass in the balloon (kg)ĭρ = change in density due to temperature difference (kg/m 3 )

The change in gravity force (weight) of the air volume is the potential lifting force of the balloon. The temperature of the surrounding air is 20 o C. The mass of 10 m 3 air can be calculated asĮxample - Lifting Force of a Hot Air BalloonĪn air balloon with volume 10 m 3 is heated to 100 o C. The mass of 10 m 3 air can be calculated asĮxample - Mass of Air at Temperature 20 o Cįrom the table above - the density of air is 1.205 kg/m 3 at 20 o C. Temperature ChartĮxample - Mass of Air at Temperature 100 o Cįrom the table above - the density of air is 0.946 kg/m 3 at 100 o C. The triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium.ĭownload and print Air - Density vs. The curve between the triple point and the critical point shows the air boiling point with changes in pressure.Īt the critical point there is no change of state when pressure is increased or if heat is added. The phase diagram for air shows the phase behavior with changes in temperature and pressure. However, at low temperature and high pressures the gas mixture becomes a liquid.

Īir is a mixture of gases at standard conditions. See also more about atmospheric pressure, and STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure ,Īs well as Thermophysical properties of: Acetone, Acetylene, Ammonia, Argon, Benzene, Butane, Carbon dioxide, Carbon monoxide, Ethane, Ethanol, Ethylene, Helium, Hydrogen, Hydrogen sulfide, Methane, Methanol, Nitrogen, Oxygen, Pentane, Propane, Toluene, Water and Heavy water, D 2 O. Specific heat (heat capacity) at varying temperature.

Specific heat (heat capacity) at varying pressure.Properties at gas-liquid equilibrium condition.Diffusion coefficients of gases in excess of air.Density, specific weight and thermal expansion coefficient at varying temperature.Viscosity, kinematic, at 0☌ and 1 bara: 0.00001349 m 2 /s = 13.49 cSt = 0.0001452 ft 2 /sįollow the links below to get values for the listed properties of air at varying pressure and temperature :.Specific heat capacity (C v ) air at 0☌ and 1 bara: 0.7171 kJ/kgK = 0.17128 Btu(IT)/(lb m ☏) or kcal/(kg K).Specific heat capacity (C p ) air at 0☌ and 1 bara: 1.006 kJ/kgK = 0.24028 Btu(IT)/(lb m ☏) or kcal/(kg K).Liquid density at boiling point and 1 bar: 875.50 kg/m 3 = 54.656 lb/ft 3.Bulk modulus elasticity : 1.01325 x 10 5 Pa or N/m 2.

Viscosity units in english