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.
As altitude  increases, the air becomes less dense because of the smaller amount  of air above that altitude. There is a corresponding decrease in  pressure with an increase in altitude. Eventually you reach a point  without air, and the pressure decreases to zero. That is space. + 91 others found this useful.