Explain any two properties of air with the help of an activity
Answers
Answer:
The world we live in is covered with air, called the atmosphere. Although we can't see it, the air in our atmosphere is made up of a mixture of colorless gases. Earth's gravity pulls the air to the planet's surface. This is why the air in the atmosphere is densest near the ground (where the pull of gravity is greatest). The higher you go, the thinner the air becomes. Air pushes on all surfaces that it touches.
In this activity students will be conducting investigations that will help them develop and refine their ideas about air. To start the lesson students will be asked to write an explanation of what air is. At various points in the lesson they will be asked to revisit their explanations and refine them based on the phenomena they have experienced in the lesson.
This lesson addresses some of the physical properties of air on the substance level in order to help students’ build toward future understanding of how air particles behave on a molecular level. However, such concepts should not be introduced at this time. Research indicates that students of all ages show a wide range of beliefs about the nature and behavior of particles and have difficulty in appreciating the intrinsic motion of particles in solids, liquids and gases
Explanation:
Air is a mixture of gases, 78% nitrogen and 21% oxygen with traces of water vapor, carbon dioxide, argon, and various other components. We usually model air as a uniform (no variation or fluctuation) gas with properties that are averaged from all the individual components.
Air has temperature. Like most things around us, air expands when it gets hot and contracts when it gets cold. Temperature has an effect on Volume, and that Volume has an effect on Pressure
Air has weight. Because the weight of air varies with pressure and temperature it has to be defined accurately. ...
Experiment
Magic Water Glass Trick
Fill a glass one-third with water. Cover the mouth with an index card and invert (holding the card in place) over a sink. Remove your hand from the card. Voila! The card stays in place because air is heavier than water, and the card experiences about 15 pounds of force pushing upward by the air and only about one pound of force pushing downward from the water - hence the card stays in place. (Try this trick over someone's head when you get