Why is density of air more in the lower part of the atmosphere?
because at the upper part of the atmosphere, there is less weight on the air molecules, making them less compressed. The air at lower altitudes is denser because it is pressed down by the weight of all the air molecules above.
Where is the density of the air greatest in the atmosphere?
sea level
Why is air denser at lower level than at higher altitude?
– In the similar way the gravity decreases with increase in altitude and because of this there is less air pushing down from the above and hence the air molecules at higher altitudes can spread out more. Therefore, at higher altitudes the density of air decreases and at the lower levels the density is more.
Why is the density of air greater near the surface of the earth?
The closer to the Earth’s surface, the greater the weight (or force) of the atmosphere because air near the surface has ALL air above it pushing down on it. The more compact (or close) those molecules are to each other, the more dense the atmosphere.
How can air density be reduced?
Density and pressure/temperature As pressure increases, with temperature constant, density increases. Conversely when temperature increases, with pressure constant, density decreases. Air density will decrease by about 1% for a decrease of 10 hPa in pressure or 3 °C increase in temperature.
Is air more dense than water?
Water is heavier than air because it is DENSER. This means that more water molecules are packed into a given volume. Water density = 1,000 kilograms per cubic meter!!! The water molecule itself, H2O, is actually less massive than a Nitrogen molecule, N2, which makes up 80% of our air.
Which is less dense air or water?
We will now determine how “much less” the density of air is to water. Water has a density of 1000 kg/m^3. Therefore, at sea level, air is 784 times less dense than water. Expressed in another way, a volume of air at sea level has 0.1275% of the density of the same volume of water.
Does air have less density than water?
Air has a density of about 1.2 g /litre, and water has a density of about 1 kg /litre. Air is therefore about 830 times less dense than water.
Does cold air rise or sink?
Cold air sinks. Sinking air compresses and heats. As air sinks, air pressure at the surface is raised. Cold air holds less moisture than warm.
Is hot air lighter or heavier?
Hot air is lighter than cold air. The reason fr this is when air gets heated up it expands and becomes less dense than the air surrounding it also the distance between the molecules increases. So the less dense air floats in the much denser air just like ice floats on water as ice is less dense than water.
Which is lighter warm or cold air?
Less dense air floats over more dense air So Warm air is lighter than cold air.so Warm air is heavier than cold air statement is (C) False because molecules of warm air expand and become less dense. Note: For constant mass, density of a gas is inversely proportional to volume of gas.
What is true warm air?
Warm air is lighter than cold air because they have more heat energy, which results in the increase in distances between the molecules. This decraeses the density, and hence makes it lighter than cold air.
What air is heavy and comes down?
warm air is heavy and comes down.
Why does the air feel thick?
As the relative humidity gets closer to 100%, less moisture can be evaporated from the body. Thus, the humidity will contribute to the body feeling hotter and thus that can give a feeling of heaviness to the air. A third reason is because air that is hotter has the capacity to contain more water vapor.
Is hot air high or low pressure?
Warm air rises, creating a low pressure zone; cool air sinks, creating a high pressure zone. Air that moves horizontally between high and low pressure zones makes wind. The greater the pressure difference between the pressure zones the faster the wind moves. Convection in the atmosphere creates the planet’s weather.
Is high pressure hot or cold?
High pressure systems can be cold or warm, humid or dry. The origin of a high-pressure region determines its weather characteristics. If a high-pressure system moves into Wisconsin from the south during the summer, the weather is usually warm and clear.
Does high pressure mean good or bad weather?
High-pressure areas usually are areas of fair, settled weather. Low-pressure areas are places where the atmosphere is relatively thin. Winds blow inward toward these areas.
Is high pressure dry?
High-pressure systems are often relatively dry or low in humidity; since the air grows warmer as it sinks and becomes compressed, the amount of moisture it can hold increases, causing more evaporation of water at the surface and hence low humidity.