When air is combined in a testing chamber so that its total air pressure is 400 mm hg, its partial pressure of oxygen is 40 mm hg.
Holding a knife against a piece of fruit will demonstrate pressure in an easy way. It won't cut the surface of the fruit if you press the flat part of the knife against it. Low pressure causes the force to be dispersed over a large region.
Due to the feeling of misery and pain, most people view emotional pressure as something undesirable. No sane individual would advocate seeking out stress as a positive thing. However, some claim that growth is based on the pressure that stressful conditions bring.
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