It is computed from information on the pre-launch dry mass, propellant mass, and used propellant, computed from the temperature and pressure readings in the spacecraft telemetry.
The weight buildup of a rocketplane vehicle will determine whether it is possible to enclose the required volume of propellant in an aircraft that weighs little enough to permit that propellant to launch it into space.
The consumer goods giant compressed deodorant in its aerosol sprays for Sure, Dove and Vaseline with the aim of reducing product sizes, halving its volume of propellant gas and cutting aluminium use by 25%.
One of those phase changes, the patent application points out, occurs at approximately 90 degrees Fahrenheit and is accompanied by large changes in volume to the propellant, which is placed in airbag inflaters in the form of wafers or tablets that resemble aspirin pills.
The later designed device provides a larger expansion chamber volume to enhance the propellant evaporation, recirculation, bubble generation and growth inside the chamber, and it makes a significant improvement to produce finer sprays than the earlier design.
The starting time monotonically changes with variations of the liquid regulator parameters, first decreasing and then increasing with the mass change of the solid propellant charge of the start cartridge, initial gas cavity volume of the pressure amplified tank and initial gas cushion of the propellant tank.
The motivation for such a development is to discard the need for a shell casing whereby carrying only propellant and bullets will reduce both the mass and volume per shot.
The larger the expansion chamber volume, the more room for the propellant evaporation, recirculation, bubble generation and growth, all of which produces finer sprays.
Within a restricted volume, the production of hot gases by a burning propellant causes an increase in pressure.
