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Yogita Ingle 6 years, 2 months ago
The Regional Continuity model of human origin asserts that modern Homo sapiens developed from different regional populations of archaic Homo sapiens that had previously evolved from regional populations of Homo erectus.
The replacement model asserts that there was a single origin of Homo sapiens in Africa and that these anatomically modern humans migrated out from Africa and replaced all other lesser-evolved humans throughout Europe and Asia.
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Yogita Ingle 6 years, 2 months ago
A gas can be converted into a liquid through a process called liquefaction.
Liquefaction of a gas can occur only when the intermolecular force of attraction between the gas molecules are increased.
Methods for liquefaction:
(i) Increase in pressure of the gas at room temperature: On increasing pressure the gas molecules come closer to each other, results in an increase in the intermolecular forces of attraction between the molecules, which leads to the liquefaction of gases.
(ii) Decrease in the temperature of the gas:
As the gas gets cooled the kinetic energy of the gas molecules decreases, results in the decrease of the speed of their random motion and in the increase of the force of attraction between them.
Carbon dioxide, ammonia, sulphur dioxide and hydrogen chloride can be liquefied by increasing the pressure and decreasing the temperature.
There are some gases, which cannot be liquefied at room temperature even at very high pressure. These gases are called as permanent gases.
Ex: H2, He, O2.
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Saloni Jain 6 years, 2 months ago
1Thank You