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• Electric acceleration
  ...the propellant mass the greater the propulsive force, but the greater the mass of propellant you must carry. The real key is to increase the exit velocity ...efficiency. Heavy gasses like Xenon and Krypton are a way to increase gas mass without increasing the number of ions.
  5 KB (841 words) - 04:02, 21 January 2009
• Exhaust velocity
  m_e is the [[reaction mass]] of the rocket engine<br> <math>\gamma</math> is the [[universal gas constant|ratio of specific heats]] of the exhaust<br>
  8 KB (1,440 words) - 04:02, 21 January 2009
• Greenhouse
  ...house using primarily solar heating must both have a great deal of thermal mass and have solar thermal collectors which extend beyond its growing area in o ...stops and heat is lost only from the collector, not the greenhouse thermal mass.
  21 KB (3,373 words) - 04:02, 21 January 2009
• Model 2 The Greenhouse as Flow Heat Exchanger
  ...gas flows (the air inside the greenhouse and the air outside it) with some ratio of capacity rates, R_c: ...at capacity|specific heat]] at constant pressure, c_p, times its mass flow rate, m’. The minimum capacity rate is whichever can absorb the lea
  2 KB (383 words) - 04:02, 21 January 2009
• NILFiR
  ...mixture of pure elemental Lithium and Beryllium in a carefully controlled ratio. The reactor would involve fairly similar technology to a Molten Salt reac ...his will happen in a fairly small fraction of cases. At the optimal Be:Li ratio for neutron production of 1.68, 22% of neutrons will be absorbed by Berylli
  5 KB (805 words) - 10:22, 1 September 2010
• Parts per million
  ...as the mass of the solute (solution component) of interest, divided by the mass of the entire solution, and multiplied by <math>10^6</math>. Parts per million is a ratio of masses, not volumes, and is technically dimensionless. Approximate conv
  541 bytes (80 words) - 04:02, 21 January 2009
• Rocket equation
  R = [[Mass Ratio]] of Rocket If mass is exhausted from a rocket engine at some mass flow rate m'_e and some exhaust velocity v_e, then that
  2 KB (397 words) - 14:04, 9 April 2010
• Scram jet
  ...d potentially produce a [[SSTO]] ]]reusable launch vehicle]] with a [[mass ratio]] 16 times better than what is possible from non air breathing vehicles. ...ecause the mass of the [[oxidizer]] ([[oxygen]]) is 16 times more than the mass of the [[reducer]] ([[hydrogen]]). Despite the scram jets superior performa
  3 KB (551 words) - 04:02, 21 January 2009
• Thermodynamic cycle
  ...lly characterized by high efficiency yet a lower ratio of power output per mass. They can be found on airplanes but are rarely found in automobiles. A comp ...enerations metal cooled reactors can achieve a much higher power to weight ratio then water cooled reactors or even reactors cooled by reffergerents as in t
  4 KB (711 words) - 04:02, 21 January 2009
• RocketDesignSpreadsheet
  ...to obtain better dry mass estimates, so that rocket performance (i.e. Mass Ratio) can be better calculated. The spreadsheet can be downloaded here: ...can make high level changes such as tank volume and overall thrust to mass ratio and it will scale the details of the rocket accordingly. This will let the
  5 KB (920 words) - 12:56, 15 August 2009
• Twin-stage to orbit
  ...ater, such a craft may be capable of reaching Mach 10 with a modest [[mass ratio]].
  2 KB (334 words) - 07:53, 10 December 2009