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Gases do not posses any definite shape or volume. They will completely fill all the space available to them. The tendency of a gas to fill the available volume within a container is the result of the freedom that gas particles have to move everywhere in the available ..

Shape and volume - Gases do not posses any definite shape or volume. They will completely fill all the space available to them. The tendency of a gas to fill the available volume within a container is the result of the freedom that gas particles have to move everywhere in the ..

Dr. S. Chandrasekhar, the great Indian Astrophysicist, after several years of hard work, proved that star smaller than 1.44 times the solar mass end up as "white dwarfs". Bigger ones explode as supernova and developing on their size, end up as Neutron stars or Black holes. The limit 1.44..

Similar physical and chemical properties are shown by elements in a group. However the first member of each group differs from its succeeding members (called congeners). This mainly occurs because of, The small size of the atom and its ion. The high ionization energy and electronega..

The parameters like calorific value and rate of combustion make one fuel better than the other. Some attributes of an ideal fuel are: High calorific value Proper ignition temperature Moderate rate of combustion Low content of non - volatile material Absence of poisonous pro..

The heat and light energy emitted by the sun's radiation is called solar energy. Earth receives about 640 J of energy per second per square metre from the sun. The Sun's energy has two aspects. The 'heating effect' of sunlight, which is due to the infrared radiation present in the sun rays and the..

judiciously use the resources that are available in plenty and maintain them without depletion or pollution restrict the use of the already endangered resources and protect them from unsustainable development. to increase awareness about the concept of sustainable development and ..

Availability of soil water - capillary water Soil temperature - temperature below 4 o C reduces the absorption of water. Absorption is maximum between 20 o C to 30 o soil - temperature Soil solutes - high soil solutes inhibit absorption Aeration of soil -..

Global warming has already occurred and will continue to do so. Evaporation will increase as climate warms and there will be an increase in average global precipitation. Local climate conditions are likely to change depending on the modifications of local rainfall patterns. The quality and quantit..

Death of animals, birds Reasons - Ammonia released by carcasses of animals, birds. Water collection from forest areas - For e.g., Nitrates and ammonia compounds from rich forest soils Natural mineral deposits - For e.g., Deposits of bauxites The secondary source of water pollution can be a..