We can feel the air when it is moving. Justify this statement by giving examples.

As we look at our surroundings, we see a large variety of things with different shapes, sizes and textures. Everything in this universe is made up of material which scientists have named “matter”. The air we breathe, the food we eat, stones, clouds, stars, plants and animals, even a small drop of water or a particle of sand– each thing is matter. We can also see as we look around that all the things mentioned above occupy space, that is, volume* and have mass.

Since early times, human beings have been trying to understand their surroundings. Early Indian philosophers classified matter in the form of five basic elements – the “Panch Tatva”– air, earth, fire, sky and water. According to them everything, living or nonliving, was made up of these five basic elements. Ancient Greek philosophers had arrived at a similar classification of matter.

Modern day scientists have evolved two types of classification of matter based on their physical properties and chemical nature.

In this chapter we shall learn about matter based on its physical properties. Chemical aspects of matter will be taken up in subsequent chapters.

as we look a

First of all, we sense the pressure of air around us, and this is completely static. More precisely, we sense the difference between the air pressure and internal pressure in our body. The latter is changing according to external pressure changes, therefore you don't feel slow air pressure changes, but only absupt ones. This effect is completely static, no motion of air needed.

Second, we feel the temperature of air, via sensors in the skin. More precisely, we feel the temperature of the skin, which is a function of air temperature, air humidity and to some extend relative velocity. But even at zero relative velocity you feel the air temperature.

And finally, as you noticed, there is a feeling of air motion, sensed by the movement of the fine hair on your body, and, at larger velocities, also by differences in pressure and temperature between different parts of the body.

S we look

We can feel the air when it is moving.. Justify this statement by giving examples

Heyg