https://padlet.com/n153711/n0rrbesqexvybd9d made by Disha and Avni en-us 2021-06-22 03:10:31 UTC 2021-06-22 03:44:13 UTC hello@padlet.com n153711 https://padlet.com/n153711/n0rrbesqexvybd9d/wish/1618831157 Air is all around us, but we can’t see it. So what is air, exactly? It’s a mixture of different gases. The air in Earth’s atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen

]]> 2021-06-22 03:12:47 UTC https://padlet.com/n153711/n0rrbesqexvybd9d/wish/1618831157 n153711 https://padlet.com/n153711/n0rrbesqexvybd9d/wish/1618837228 While air is mostly gas, it also holds lots of tiny particles. These particles in the air are called aerosols. Some aerosols—like dust and pollen—are picked up naturally when the wind blows. But the air can also carry particles that cause air pollution, such as the soot, smoke, and other pollutants from car exhaust and power plants. When there are too many particles in the air, it can be difficult for plants and animals to breathe]]> 2021-06-22 03:16:22 UTC https://padlet.com/n153711/n0rrbesqexvybd9d/wish/1618837228 n153711 https://padlet.com/n153711/n0rrbesqexvybd9d/wish/1618841884 Air is important for living things
People need to breathe, and so do lots of other animals—and plants! 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!]]> 2021-06-22 03:19:15 UTC https://padlet.com/n153711/n0rrbesqexvybd9d/wish/1618841884 n153711 https://padlet.com/n153711/n0rrbesqexvybd9d/wish/1618869611 When it’s a hot, muggy summer day, you’ve probably heard the word “humid.” But what does that mean, exactly? Relative humidity is the amount of water that the air can hold before it rains. Humidity is usually measured in percentages, so the highest level of relative humidity—right before it rains—is 100%. Humidity in the air is measured with an instrument called a psychrometer]]> 2021-06-22 03:36:28 UTC https://padlet.com/n153711/n0rrbesqexvybd9d/wish/1618869611 n153711 https://padlet.com/n153711/n0rrbesqexvybd9d/wish/1618871852 On Earth, we’re pretty lucky to have an atmosphere filled with air. The air in our atmosphere acts as insulation, keeping the Earth from getting too cold or too hot. Ozone, another type of gas in the air, also protects us from too much sunlight. Air in the atmosphere can also protect us from meteoroids. When meteoroids contact our atmosphere, they rub against the air and oftentimes are burned into small pieces before reaching Earth.]]> 2021-06-22 03:37:49 UTC https://padlet.com/n153711/n0rrbesqexvybd9d/wish/1618871852