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low pressure Thus, there is tendency towards equalisation of temperature and pressure all over the Universe Efficiency of a heat engine is greater of the difference of temperatures between the source and the exhaust is large, 1 e greater the difference of temperatures, the higher is the efficiency In other words, we can say that the availability of energy for doing work is becoming less and less every moment and when the temperature and pressure will become the same everywhere, the available energy for work will become zero and the entire universe will come to a stand still The sum total of the energy in the universe will be the same as before but it will not be available for work Living beings will neither be able to move nor to breathe Blood will not circulate in their veins Life of all forms will be extinct
What next ? is a glaring question before the scientists They believe that the universe cannot end as declared by Einstein in his Cylinder theory referred to in the beginning Some unknown forcc must rewind the clock of the Universe so that it may be set running once again According to Hindu belief, the rewinding is done by the Almighty God whereas according to Jains, the process is automatic
There is another line of thinking in science According to this, sun is the source of energy for all life on earth According to the principle of equivalence between mass and energy, sun is loosing its mass at the rate of 46,000 tons per second and if it continues to radiate energy at the present rate, its mass will be reduced to zero after a few billion years, Universe becomes devoid of solar energy, all life on earth will disappear and it will be a sort of Pralaya
In recent years, another interesting discovery has been made It is well known that the magnetic north pole does not coincide with the geographical north pole There is an angle between them Now, it has been found that magnetic poles of the earth are slowly rotating and a time will come when the north pole will go into the position of south pole and vice versa In between, there will be a period of 100-200 years when the earth will have no magnetic field at all because when we go from a negative quantity to a positive one, zero comes in between
The earth's magnetic field acts like an umbrella for the showers of destructive cosmic rays which are coming profusely from inter-stellar space The earth's magnetic field deflects them to one side and it is only in very small numbers that they are able to reach us The rotation of the poles has a period of about 7,50,000 years and the last reversal took place some 7,00,000 years back Thus after 40 to 50 thousand years, it is likely to occur again At the time of zero magnetic field, all cosmic ray showers fall upon the earth with full destructive force and the latter is completely scorched to death This is Mahapralaya
On 30th June, 1908, there was an unusual explosion in Siberia in the Soviet Union The explosion may be compared to a 30 megaton hydrogen bomb explosion, 1 e equal to 1500 Hiroshima atomic bombs exploding together American
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