INTRODUCTION
Cryogenics originated from two Greek words kyros which means cold or freezing and genes which means born or produced. Cryogenics is the study of very low temperatures or the production of the same. Liquefied gases like liquid nitrogen and liquid oxygen are used in many cryogenic applications. Liquid nitrogen is the most commonly used element in cryogenics and is legally purchasable around the world. Liquid helium is also commonly used and allows for the lowest temperatures to be reached. These ....etc

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In fluid dynamics, a fluid's velocity must increase as it passes through a constriction in accord with the principle of mass continuity, while its static pressure must decrease in accord with the principle of conservation of mechanical energy. Thus any gain in kinetic energy a fluid may accrue due to its increased velocity through a constriction is balanced by a drop in pressure.

By measuring the change in pressure, the flow rate can be determined, as in various flow measurement devices such as venturi meters, venturi nozzles and orifice pla ....etc

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CHEMICAL ROCKET ENGINES
1. INTRODUCTION
Chemical rocket engines, like those on the space shuttle, work by burning two gases to create heat, which causes the gases to expand and exit the engine through a nozzle. In so doing they create the thrust that lifts the shuttle into orbit. Smaller chemical engines are used to change orbits or to keep satellites in a particular orbit. For getting to very distant parts of the solar system chemical engines have the drawback in that it takes an enormous amount of fuel to deliver the p ....etc

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see
http://grc.nasa.gov/WW/ion/past/70s/sert2.htm
http://spacebusinesstechnology/090603-tw-glxp-lunatrex.html

The Lunatrex spacecraft would build up speed in Earth orbit before setting off for its lunar destination, giving the team plenty of time to adjust if needed.

for getting little information ....etc

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Rocket engines
Rocket Engines are reaction engines and obtain thrust in accordance with Newton's third law. A rocket engine is a jet engine that uses only propellant mass for forming its high speed propulsive jet. Most of them are internal combustion engines.

Principle of operation
Rocket engines produce thrust by the expulsion of a high-speed fluid exhaust which is a gas most of the times, created by high pressure (10-200 bar) combustion of solid or liquid propellants, consisting of fuel and oxidiser components in the comb ....etc

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Describe the thermal jet engine and the chemical rocket engine stating clearly the difference between them ....etc

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