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The particles in heated air gain energy from the heat. This energy is transformed to some degree to kinetic energy, which causes the particles to move faster and push each other away. The particles then have more space between them, and the heated air takes up a larger volume of space. Since density is the mass per unit volume (mass divided by volume), a larger volume has proportionally less mass in it and the heated air has a smaller density.
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoThe cooler the air, the denser it is. Thus, vice-versa.
Density, weight, temperature and pressure of ALL gases is subject to Boyle's Law which you can check out yourself. Boyle's Law really deals with gases in a finite or enclosed space but has limited applications in free space also. The athmosphere surrounding our earth stays there purely as an effect of gravity and is subject to Newton's Law which you can also check out for yourself. The air closest to the centre/center of the earth is densest for two reasons, one being that it IS closer to the centre of the earth so the effect of gravity is greater, the other being that the air ABOVE it is pressing down on it.
Warmer air is less dense than colder air because its molecules contain more inherent energy and can push each other out of the way. Colder air has less inherent energy so it packs up more and thus is denser. An analogy is to watch people on a dance-floor waving their arms around and making extra space for themselves by expending energy. If they stop dancing just to listen to the band they usually crowd in closer, expend little energy and leave lots of empty space on the floor. But as soon as they all start dancing and expending energy again they spread out so that the density of people on the used floorspace is less dense.
Wiki User
∙ 11y agoAir becomes less dense when it is warmed because the particles have more kinetic energy and move around faster, creating a larger volume for the same mass, which is a decrease in density.
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Why does heated gas become lighter?
Heated particles are not actually lighter. What happens is that heated particles require more area. This increase in area is observed as an increase in volume. This reduces the number of particle in a given space. This means that the heated air is less dense. Due to buoyancy, things that are less dense "float" on top of denser things. This is why a hot air balloon rises.
How does the density of most substances change when they are heated?
generally, the density of a substance decreaces when heated, with the exception of ice, which is less dense than water.
What happens to the density when heat is added?
The density of air when it is heated decreases
Does polar water diluted by melting ice become less or less dense?
less denser than
How are temperature and density of air related?
cold air has higher density, by hot air is opposite
What happens to the air when heated up?
iit will become less dense
Do convection currents form in the mantle when heated materials become more dense?
Yes, convection currents form in the mantle due to the heating and cooling of material, which causes density differences and drives the movement of material. When material in the mantle is heated, it becomes less dense and rises, while cooler, denser material sinks, creating a circulation pattern known as mantle convection.
Why do most things come less dense when heated?
the gain of energy causes the molecules to vibrate and bounce off each other, causing them to become farther apart.
Do heated air particles become more or less dense?
Things (almost everything, including air) becomes less dense when it is heated. So warm air rises, and cold air falls.
Why does a fluid become lss dense when its heated?
On heating the inter molecular space decreases. So, substance becomes less dense on heating.
Why does convection happens?
convection happens because fluids become less dense and expand and riseas they are heated.
Is it true molten material in the asthenosphere rises in convection currents because heated materials become more dense?
Actually, hot, less dense material rises, and cold, denser material sinks. Denser material will be heavier (per unit volume) and gravity therefore pulls it down. Less dense material has buoyancy and rises. It's very logical.
How does convection cause an increase in temperature?
it occurs because most liquids and gases become less dense when heated
Do plates become more dense or less dense when they become cooler?
Cooler material is more dense and hotter material is less. This means that plates become more dense as they cool.
When water is heated why it gets less denser?
The particles get further away from each other as water is heated therefore making it less dense
Why is the molasses going faster it is heated?
Warmer things are less dense, so as the molasses gets warmer, it becomes less dense or more "liquidy."
Why does heated gas become lighter?
Heated particles are not actually lighter. What happens is that heated particles require more area. This increase in area is observed as an increase in volume. This reduces the number of particle in a given space. This means that the heated air is less dense. Due to buoyancy, things that are less dense "float" on top of denser things. This is why a hot air balloon rises.
