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 easily. Through ..
Introduction
The branch of Physics dealing with the nature and properties of light and vision is called optic..
Introduction
Biotic community is an association of a number of interrelated and independent populations belonging to different species, in a common environment which can survive in nature..
Introduction
Oscillatory motion, or periodic motion, is the most common type of motion. Heartbeat of animals, the seasons of the year, the swinging of the pendulum of a clock and the vibrations of atoms in solids are periodic in nature..
Introduction
Gas is one of the three states of matter - the other two being liquid and solid. A gas differs from a solid and a liquid in a number of ways. A gas fills entire space available to it and therefore it has no definite shape or volume. The molecules in a gas are in a continuous motion in all..
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 through experimen..
Introduction
Very often, energy is generated at one place but consumed elsewhere. The transportation of energy from its source to the receiving end can be done in two ways: By actually moving the matter carrying kinetic energy and delivering it to the other end. By the vibration of the particles of a ..
Introduction
There are 109 elements known at present. 92 elements occur in nature, while the rest are man-made. All materials on the Earth are made of these naturally occurring elements. These are classified into metals, non-metals, and metalloids. The occurrence and extraction of some light..
Introduction
Oscillatory motion, or periodic motion, is the most common type of motion. Heartbeat of animals, the seasons of the year, the swinging of the pendulum of a clock and the vibrations of atoms in solids are periodic in nature. Two types of motion that are closely associated with oscillatory ..
Introduction
The word 'resource' means supplying a material generally held in reserve. The common natural resources include energy, air, water, land, minerals, microorganisms plants and animal..
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