Civil Engineering - Hydraulics - Discussion

Pressure on Earth varies with the altitude of the surface, so air pressure on mountains is usually lower than air pressure at sea level. Pressure varies smoothly from the Earth's surface to the top of the mesosphere. Although the pressure changes with the weather, NASA has averaged the conditions for all parts of the earth year-round. As altitude increases, atmospheric pressure decreases. One can calculate the atmospheric pressure at a given altitude. Temperature and humidity also affect the atmospheric pressure, and it is necessary to know these to compute an accurate figure. The graph at right was developed for a temperature of 15°C and relative humidity of 0%.

This happens when the temperature of air is increased. Warm air molecules have more energy, so they move faster and create more pressure. Likewise, cold air has less energy and therefore exerts less pressure on its surroundings. The denser the air is, the more molecules there are in that given space.

A is the answer.

At an elevation of 10 km (6 miles or about 30,000 feet), roughly the height of Mt. Everest, pressure drops to 265 millibars. That's less than 30% of the pressure at sea level! Both atmospheric pressure and the density of air decrease with altitude.

I think d is the right answer. Atmospheric pressure at any point is numerically equal to the weight of the air column of the unit x sectional area. Temperature can vary the weight of the air. Weather conditions also vary the weight of air.

D is correct answer.

Atmospheric pressure decreases at higher altitude, because it for cooking more time required at altitude.

And it also varies with temperature warmer air exert more pressure than colr air.

Increases with Altitude. Atmospheric Pressure has nothing to do with weather condition or temperature.

Option D is correct. Atmospheric pressure increases with altitude as well as with temperature.

The answer is A as altitude increase atmospheric pressure decrease.

Warm air are more faster and create more pressure. So it depends.

Altitude increases the atmospheric pressure decreases.