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By Daveau C., Zaghdani A.

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The pressure in a stationary liquid is a function of the depth of the liquid and its density. If a swimmer dives into water, the deeper the dive, the greater the pressure upon the body. 1). 1 The relationship between depth and pressure in a stationary liquid 32 physical states The exerted pressure by the liquid is a consequence of the contact it has with the container and the fact that the liquid has weight. h .. .. .. .. 1) Where P is pressure of the liquid, ρ is density, g is acceleration caused by gravity, and h is depth of the liquid.

Evidence of this fact is seen as expirate cools in a Douglas bag, and condensation forms on the inside of the bag. The water vapour has come from the moist airways between the nose and mouth and the lungs. Inspirate normally contains some water vapour but is rarely saturated, which is why participants sometimes complain of a dry throat following exercise. The water in the saturated expirate has come from the participant’s airways. The absolute amount of water vapour in a gas is a function of temperature.

Note that the pressure at any point within the liquid acts in all directions. 2). 2 The principle of a barometer 33 liquids barometer, one of the ends of the tube is closed and evacuated, creating a vacuum. In this arrangement, the absolute pressure can be measured. In laboratory barometers mercury is typically used. 6 times the pressure to push mercury to the same height as water. In laboratory experiments that involve collecting respiratory gases (oxygen and carbon dioxide), it is important to know the barometric pressure under which the gases are collected (see Chapter 2).

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