Meditation Tips for Beginners. 1  Guided meditation MP3s or CDs as meditation tools. For beginners, audio guided meditations provide step-by-step instructions that help to introduce meditation in an easy and non-intimidating way. 2  Aim to have the length of your exhalations as long, if not longer, than your inhalations.
While air can be compressed more easily than water, freely flowing air acts much like waterâat least at relatively low speeds. So when you squeeze a stream of air, two things happen. The air speeds up, and as it speeds up, its pressureâthe force of the air pressing against the side of the objectâgoes down. When the air slows back down, its pressure goes back up. Why does the air speed up? Because of conservation of mass, which states that mass is neither created nor destroyed, no matter what physical changes may take place.
If the force of the air were just down, it would probably collapse. Because the air also pushes up, the desk is able to stay in one piece and not collapse under the weight of your books. Think about when you go swimming. There is pressure all around you from the water. That pressure is from the water molecules around you and the air above the surface. The deeper you go, the more pressure, and you have to pop your ears. A Little About Gases The key to understanding pressure in the atmosphere is to understand how gases work.