Lesson Summary
- Air takes up space. It's made up of atoms and molecules.
- Air is made of gases, including nitrogen, oxygen, water vapor, and other materials. These substances are what give air mass.
- Air exerts pressure.
- Air has weight.
- Air can be compressed.
- Air is affected by temperature.
The three properties of air are that it has weight, can be compressed and takes up space. The fact that it can be compressed makes it quite different from solids and liquids, which are unable to be compressed. Air is a mix of gases that is composed out of about 1/5 oxygen and 4/5 nitrogen.
Air is a colourless and odourless gas. It has mass.It exerts some space. It exerts pressure since the weight of air denotes the atmospheric pressure.
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 is important for living things.
Breathing is part of a process called respiration. During respiration, a living thing takes in oxygen from the air and gives out carbon dioxide. This process gives animals and plants the energy to eat, grow, and live life!Answer: It is a compound is not a property of AIR.
Matter is anything that has mass and volume. For example, air has mass and takes up space.
Air gives shape to the objects.
Important Uses of Air
- Sustain life and growth.
- Combustion.
- Maintaining Temperature.
- Supplier of Energy.
- Photosynthesis.
Take some water in a glass or metal container like pan and heat it. Just before water begins to boil, you will notice some bubbles at the inner surface of the pan. These bubbles come from the air dissolved in water. This shows that air is dissolved in water.
In aviation and television weather reports, pressure is given in inches of mercury ("Hg), while meteorologists use millibars (mb), the unit of pressure found on weather maps.
Principles of Flying. (1) Lift, (2) Gravity force or Weight, (3) Thrust, and (4) Drag. Lift and Drag are considered aerodynamics forces because they exist due to the movement of the Airplane through the Air.
It consists of 78% nitrogen, 21% oxygen and 1 % other gases and water vapour.
Dust/Smoke. Dust is the small particles suspended freely in the air. Smoke is made up of water vapour and gases which pollute the air.
We cannot see air but we can feel its presence when it starts moving (or blowing). Moving air is called wind.
Air in water: Air is also present in water. Aquatic animals breathe the air which remains dissolved in water. When water is boiled, air bubbles can be seen coming up from the bottom of the pan. This simple activity shows that air is present in water.
Answer: (d) It is a compound. Explanation: Air is a homogeneous solution, which occupies space and it is transparent. So air is not a compound.
Air is made up of 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and other gases in meager amounts. Water vapor is also a constituent of air in varying amounts along with dust particles. The molar mass of dry air or air with no/low quantity of water vapor in it is 28.97g/mol.
Answer: Atmosphere is a blanket of air surrounding the Earth's surface. Atmosphere contains oxygen which is essential for animals to breathe and get energy from food. It also contains carbon dioxide which is used by the plants to make their own food.
Take some water in a glass or metal container like pan and heat it. Just before water begins to boil, you will notice some bubbles at the inner surface of the pan. These bubbles come from the air dissolved in water. This shows that air is dissolved in water.
Air becomes impure due to the suspended dust particles, particles of toxic substances i.e ClouroFluorocarbons and toxic gases.
What's our atmosphere made of?
- Nitrogen — 78 percent.
- Oxygen — 21 percent.
- Argon — 0.93 percent.
- Carbon dioxide — 0.04 percent.
- Trace amounts of neon, helium, methane, krypton and hydrogen, as well as water vapor.
