expansion and contraction in matter

Heat..

Matter expands on heating, i.e., solids, liquids and gases expand on heating. Let us consider expansion of solids: Three types of expansions are considered in case of solids. This classification is done according to the shape of the solid..

When pressure is applied on a gas, it contracts. Conversely, when pressure is released the gas expands. When the temperature is increased, the particles gain more energy, move faster and move away from each other. As a result the intermolecular attraction becomes less prominent. The volu..

This theory explains the physical properties of matter in terms of motion of its molecules. According to this theory, every substance (solid, liquid or gas) consists of a large number of minute particles called molecules . A molecule may be defined as the smallest particle of a substance ..

has inner circular and outer longitudinal muscles Both these layers facilitate the movement of food along the alimentary canal. The mucous coat keeps the passage smooth and mixes the food with mucus while the muscular layer by its periodic contraction and expansion moves the f..

Once the food is ingested into the mouth the action of the upper and the lower jaw crushes and grinds the food. This also stimulates the production of saliva. Saliva is thoroughly mixed with the food with the action of the jaws, teeth, inner walls of cheeks and tongue. The food is formed into bolus..

Once the food is ingested into the mouth the action of the upper and the lower jaw crushes and grinds the food. This also stimulates the production of saliva. Saliva is thoroughly mixed with the food with the action of the jaws, teeth, inner walls of cheeks and tongue. The food is formed into bolu..

Mechanism of Digestion - Once the food is ingested into the mouth the action of the upper and the lower jaw crushes and grinds the food. This also stimulates the production of saliva. Saliva is thoroughly mixed with the food with the action of the jaws, teeth, inner walls of cheeks and tongue. The ..

Introduction - We heat raw food to soften it. We freeze water into ice by cooling it in refrigerator. When we boil water in a kettle we observe the steam oozing from the mouth of the kettle. When the cork is difficult to remove, we slightly heat the mouth of the bottle, so that the cork comes out e..

Introduction - A dynamic environment of matter and material surrounds man. Since his birth he has been exposed to these changing surroundings. His curiosity to understand his surroundings and the events occurring around him, has led him to systematically enquire and collect information th..