changes in supply and demand

>Thus, if a solid is heated, its molecules vibrate more vigorously within the intermolecular space. Its internal energy increases and hence, its temperature increases. If the solids are heated further, at a certain stage their kinetic energy increases so much that many molecules can overcome interm..

There are two types of heat engines: external combustion engines and internal combustion engines. Steam engine is an example of external combustion engine. In such an engine, the fuel is burnt outside the working portion of the engine. A heat engine consists essentially of the following parts: i)..

Waste Management - We are an integral part of the environment. Our activities change the environment around us. Changes in the environment affect us. Environmental problems like depletion of the ozone layer and waste disposal are issues that have to be dealt with serious concern..

. There are some worrying facts about the water situation. The effects of world climate change are being all over including the Indian subcontinent. The increased temperature levels are resulting in changing weather patterns. For a country like India whose agricultural activitie..

The first photosynthetic organism probably appeared almost three billion years ago. With the evolution of photosynthesis, however, organisms began to change the face of our planet and, as a consequence, to exert strong influences on each other. Organisms have continued to change..

Introduction - The first photosynthetic organism probably appeared almost three billion years ago. With the evolution of photosynthesis, however, organisms began to change the face of our planet and, as a consequence, to exert strong influences on each other. Organisms have continued to h..

Introduction - Do we use dry cells for operating electrical appliance? It is not impossible to tap continuous supply of energy from electrochemical cells. Electrical circuits in homes, factories and offices receive such energy form local power companies. In most countries the energy is ..

. Everything was done so ungrudgingly and with so much love! Nothing had changed him - his seven children, cattle, fields, and household responsibilities. The second brother, pressurised by his wife, had sold his soul to greed and had become adamant about the partition. Babuli compares th..

. Not all plants and animals will be able to make the seasonal shift. Some species will be able to cope with the changes, and others will disappear. A plant migrating to a new region could wipe out native species. For eg., as the warm-water plankton moves north, it leads to a drop in the ..

Physical States of Water - Water is the only substance that can exist simultaneously in all the three states of matter, i.e., solid, liquid and gaseous on this earth,. A simple experiment shows the existence of all these three states together. Take a glass half packed with ice cubes and cover it. T..