P MIX - pressure of mixture r i - volume ratio of component i Where is: ρ i - density of component i p i - partial pressure of component i Partial pressure of one component in the mixture of gases is: If the mixture is consisting of gases then density of each component in the mixture can be calculated as: G i - weight ratio of component i r i - volume ratio of component i.Ĭalculator for LPG - liquefied petroleum gas flow rate and pipe diameter calculation.ĭensity and partial pressure of component in gas mixture Where is: M i - molar weight of component i M MIX - molar weight of mixture Where is: g i - weight ratio of component i m i - weight of component i m MIX - weight of fluid mixture įor known weight ratio, volume ratio of each component in fluid mixture is calculated:įor known volume ratio, weight ratio of each component in fluid mixture is calculated: If weight of each component in fluid mixture is known, than component weight ratio can be calculated as: V MIX - volume of fluid mixture n - total number of components. Where is: r i - volume ratio of component i V i - volume of component i If volume of each component in the fluid mixture is known, than component volume ratio can be calculated as: Where is: ρ MIX - density of fluid mixture i - density of component i r i - volume ratio of component i The density of such mixture is calculated as defined bellow.ĭensity of fluid mixture is calculated as: LPG is mixture of propane (C 3H 8), butane (C 4H 10) and other components. One of fluids that is actually mixture of several components is liquefied petroleum gas or LPG.
Of each component with its volume or weight ratio used. If the fluid being considered is the mixture of several components, physical properties such as density are calculated based on the property Gas constant of air and gas being considered.ĭensity of fluid mixture for known volume or weight ratio of component in mixture The specific gravity of gases is defined as weight ratio between molecular weight of the gas and the air, and as ratio between individual Use specific gravity calculator for conversion between API degrees, Baume degrees and specific gravity. With two kinds in use - one for liquids heavier than water and one for liquids lighter than water.įor conversion between API and Baume scales on one side and specific gravity on the other side:įor oils specific gravity SG(60 OF/60 OF):įor liquids lighter than water SG(60 OF/60 OF):įor liquids heavier than water SG(60 OF/60 OF):Īs the density of water at 15 OC is 999 kg/m 3, density of oil or other liquid can be calculated as: water density x SG(60 OF/60 OF). For measuring of specific gravity a hydrometer can be used, and two scales are common - API scale, used for oils and Baume scales The temperatures are usually the same and value of 60 OF/60 OF (15.6 OC/15.6 OC) To the water density at some standard temperature. Specific gravity (or relative density) is a relative measure of density and is ratio between the density of fluid at a specified temperature When gases are considered, the density and specific volume are changing greatly with the change of pressure and temperature. Other commonly used units for specific volume are liter per kilogram or cubicĭecimeter per kilogram which are equal to 0.001 m 3/kg.ĭensity and specific volume of liquids are changing with the change of temperature, and if high pressures are being considered,ĭensity and specific volume will change as well.
Specific volume is the volume of substance per unit of mass, and is reciprocal to density. Where is: p c - critical pressure T c - critical temperature. Where is: p r - reduced pressure T r - reduced temperature Z - compressibility factor. Compressibility factor can be calculated using Berthelot equation: Where is: p - pressure ρ - density T - absolute temperature Z - compressibility factor Ĭompressibility factor is function of pressure and temperature. Where is: p - pressure ρ - density R - gas constant T - absolute temperature.įor real gas modified equation of state is used with compressibility factor included: įor perfect gas relation between pressure, density and temperature is expressed using the equation of state: Also, other units are used for density like gram per cubic centimeter, or gram per milliliter which are both equal to 1000 kilograms per cubic meter. The unit of density is kilogram per cubic meter in SI system of units and used symbol is ρ. Where is: ρ - density m - mass V - volume.
The density is the mass of substance per unit of volume. Gas pressure, temperature and density relation Density of liquid and gas, compressibility factor.
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