Given: pressure range and densities of water and mercury The atmospheric pressure at sea level is 14.7 psi.
Atmospheric pressure is also often stated as pounds/square inch (psi). How tall a column of water do you need? (The density of water is 1.00 g/cm 3 the density of mercury is 13.53 g/cm 3.) Standard atmospheric pressure is called 1 atm of pressure and is equal to 760 mmHg and 101.3 kPa. Because of the toxicity of mercury, you decide to use water rather than mercury. Suppose you want to construct a closed-end manometer to measure gas pressures in the range 0.000–0.200 atm. Therefore, 101.325 kPa 1 atm 760 torr and 100 kPa 1 bar 750 torr. The prefix kilo means 1,000, so one kilopascal 1,000 Pa. In this case, the pressure of the gas in the bulb is the barometric pressure minus the difference in the heights of the two columns. What is the equivalent pressure of 760 Torr in units of mm Hg what is the equivalent pressure of 760 Torr in units of mm Hg 1 atm 101,325 Pascals 760 mm Hg 760 torr 14.7 psi. If the gas in the bulb has a pressure less than that of the atmosphere, then the height of the mercury will be greater in the arm attached to the bulb. The pressure of the gas in the bulb is therefore the sum of the barometric pressure (measured with a barometer) and the difference in the heights of the two columns. If the gas in the bulb has a higher pressure, the mercury in the open tube will be forced up by the gas pushing down on the mercury in the other arm of the U-shaped tube. Metric prefixes are used for properly expressing the base.
It is also important to memorize common metric prefixes as shown in Table 5. \[P=\dfrac\), then the two columns of mercury have the same height only if the gas in the bulb has a pressure equal to the barometric pressure. 1 atm 14.696 psi 1 atm 760 mmHg (exact) torr mmHg (memorize) 4.184 J 1 cal 1 kWh 3.60x10 6 J Cal kcal (memorize) (Cal: is the unit used to report energy in foods) abbreviations listed in Table 4. The pressure at sea level also corresponds to the amount of air pressure that will support a column of Mercury 760 mm high at 0 degrees Celsius under standard gravity, or 14.7 pounds per square inch (1.01325 × 105 pascals). If the air in a balloon is heated, the increased kinetic energy of the gas eventually causes the balloon to burst because of the increased pressure (\(P\)) of the gas, the force (\(F\)) per unit area (\(A\)) of surface: By definition 1 ATM is the air pressure at sea level. The air in a balloon, for example, exerts a force against the interior surface of the balloon, and a liquid injected into a mold exerts a force against the interior surface of the mold, just as a chair exerts a force against the floor because of its mass and the effects of gravity. Any object, whether it is your computer, a person, or a sample of gas, exerts a force on any surface with which it comes in contact.
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