At pressure
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The document discusses atmospheric pressure and different ways of measuring it. It explains that atmospheric pressure decreases with altitude due to lower air density and temperature. Standard atmospheric pressure at sea level is approximately 760 mmHg or 101,325 Pascals. The document also describes various instruments used to measure pressure, including mercury barometers, aneroid barometers, and manometers.
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Each time you take a step or a vehicle changes speed or direction, it is experiencing acceleration. Acceleration is the rate of change of velocity over time and can be calculated as the change in velocity divided by the time elapsed. For example, a car accelerating from 60 mph to 90 mph in 3 seconds has an acceleration of 10 mph/s. Acceleration can be positive, like the car speeding up, or negative, like when braking and slowing down. Over time, the constant acceleration due to gravity causes objects in free fall to increase their velocity, gaining 10 m/s every second until air resistance balances the downward force.
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1) Acceleration is the rate of change of velocity with time. It can be positive, indicating an increase in speed or change in direction, or negative, indicating a decrease in speed or change in direction.
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This document discusses velocity and how to calculate it. It provides examples of:
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1) The document discusses gas and atmospheric pressure. It explains concepts like kinetic theory of gases, atmospheric pressure, units of measurement, and how pressure is affected by factors like altitude, temperature, and volume.
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At pressure
- 1. Atmospheric Pressure and Layers Lesson 1
- 3. Atmospheric Pressure . . . . . . .. . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .. . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . .. .. . . . . . . . . . . . ..... . .. . . . . . .. ... . . . . . . . .. . . . .. . .. .
- 4. Drop of Pressure Drop of Pressure
- 5. Atmospheric Pressure Atmospheric pressure is the force exerted on the Earth’s surface by air molecules of the atmosphere per unit area of the surface Pr Force essure Area Atmospheric pressure decreases with altitude. Reason : 1. At a higher altitude, the density of the air is lower. 2. At a higher altitude, the temperature of the air is lower, hence less collisions.
- 6. • 760 mm Hg • Standard Atmospheric pressure (1 atmosphere) • 0.76x 13600 x 10 Pa = 103360 Pa = 103360 N m-2 • = 1.0336 x 105 Pa = 1.0336 bar of pressure • 10.336 m water Mercury barometer At sea level, h = 760 mm 760 mm Hg 1 atm. 105 Pa 105 N m-2 10 m water 76 cm Hg 1 bar pf pressure VARIOUS UNITS OF ATMOSPHERIC PRESSURE
- 8. 760mm Hg = 1.0atm = 101.325kPa = 1013.25 mb Standard Atmospheric Pressure
- 9. The reading of a mercury barometer at a meteorological station is 745 mm mercury. What is the value of the atmospheric pressure at the meteorological station in pascal ? EVALUATION
- 11. Precision Aneroid Barometer Precision Aneroid Barometer
- 12. EVALUATION 1. If 10 cm3 of mercury is added into the bowl, what happen to the value of h ? A > 76 mm B < 76 mm C 76 mm h = 76 mm
- 13. A P B P and Q C Q and R D P, Q and R EVALUATION 2. A barometer is placed in an region where the atmospheric pressure is 76 mm Hg. Which of the diagrams shows the correct level of the mercury. h = 76 mm h = 76 mm vapour h > 76 mm P Q R
- 14. EVALUATION 3. Figure shows a soft toy hung on a suction cup. The soft toy does not fall to the floor because the pressure in A P > Q B P = Q C P < Q D Q = 0
- 15. The atmospheric pressure is 760 mm Hg and the difference in the mercury level of a manometer measuring the pressure of a gas is 20 mm. What is the pressure of the gas in mm Hg ? EVALUATION