In order to overcome some of the diffculties,A.C.Tachometer Generators are used.The Tachometer has Rotating Magnet which may be either Permanent
Magnet or an Electromagnet.The Coil is wound on the Stator and therefore the problems associated with Commutator (as in D.C.Tachometer) are absent.

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The defination of Steam Turbine by Garham is "The Turbine is a Prime Mover in which a Rotary Motion is obtained by Centrifugal Force brought into action
by changing the direction of a Jet a fluid escaping from a Nozzle at high Velocity".

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The Gas is the term applied to the state of any Substance of which the Evaporation from the Liquid state is complete.Examples are Air,Oxygen,Nitrogen etc.

Vapour may be defined as a partially Evaporated Liquid and consist of the pure gaseous state together with the particles of Liquid in suspension."Superheating" is the process where Dry Vapour is heated further.This Superheated Vapours approximately behaves like a Gas.Example of Vapours used

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Various methods are used for heating and expanding the Gases.these methods are also applicable to the contraction or cooling of gases.The contraction means negative expansion and cooling means negative heating.

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Sea sickness is a form of motion sickness attributed too the movement felt while on a boat. Although no one has died directly from sea sickness people have died from asphyxiation from inhaling their vomit. But for the vast majority sea sickness is just a very unpleasant experience which will eventually pass as your body becomes accustomed too the movement of the ship.

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After five years of monitoring, astronomers in Europe have discovered a batch of three "super-Earths" orbiting a nearby star, and two other solar systems with small planets as well. Their findings, presented at a conference in France, suggest that Earth-like planets may be very common. It’s as if every single star harbor planets but the conclusive answer is not yet known but the astronomers are making huge progress towards it. The three super-Earths planets orbit a star slightly less massive than our Sun and this star is 42 light-years away towards the southern Doradus and Pictor constellations. One light-year is the distance light can travel in one year at a speed of 186,000 miles a second which is equivalent to 9.5 trillion kilometers. The three super-Earths planets are each bigger than the Earth. One is 4.2 times the mass of earth, the other is 6.7 times the mass of earth and the third planet is 9.4 times the mass of earth. They orbit their star at extremely rapid speeds. One of the planets is orbiting in just four days, compared with Earth's 365 days, the other planet is orbiting in just 10 days and the third is the slowest orbiting in 20 days.

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