Place a candle below one of the two bags. It is observed that the bag below which the candle is placed is used up as shown in figure (B). This is because the air become lighter and expands. This activity proves that warm air is lighter than cool air.
How will you show that warm air is lighter than cold air?
As the distance between molecules increases, the volume also increases. Since volume is inversely proportional to the density, as the volume increases the density will decrease. Less dense air floats over more dense air so hot air is lighter than cold air.
Why warm air is lighter than cold air?
Warm air is lighter than cold air because on heating the air expands and occupies more space. When the same thing occupies more space, it becomes lighter and is lesser. The warm air rises up since it is lighter.
Which activity helps to prove that warm air is lighter than cold air describe in detail in your own words?
When a burning candle is placed below the left side paper bag, the air above the candle flame gets heated. The hot air, being lighter, rises up and fills the left side paper bag(by displacing the heavier, cold air from it).
Is warm air lighter than cold air True or false?
Warm air is lighter than cold air because its particles have more heat energy, which results in the increase in distances between the molecules. This decreases the density, and hence makes it lighter than cold air.
Which of the two is heavier warm air or cold air?
The difference in barometric pressure between observation sites at different elevations is a measure of the density of air in a column of air between those two elevations. Cold air is denser than warm air.
Why is cold air more dense than warm air?
Air Density and Temperature This is because warmer molecules of air move faster, creating an expansion effect that decreases air density. Colder air moves slower, collects together, and sinks with higher density. This is why warm air rises above cold air.
Why do we fill a bicycle tube with air Class 7?
As we know air expands on heating. In the summer, due to this expansion its volume increases which may lead to the tyre bursting. Therefore, to avoid this a little less air is filled in a bicycle tube during summer. Q.
What are the effects of air pressure Class 7?
Air pressure helps in the generation of winds. They cause storms to form due to the difference in air pressure. They also cause the generation of convection type of rainfall.
What are the properties of air for Class 7?
The properties of air are:Air is a mixture of many gases, water vapours and dust particles.Air exerts pressure.Air has mass.Air occupies space.Air is colourless and odourless.
Which of the following statement about warm air and cold air is true?
Warm air is lighter than the cold air. When air gets heated up it expands, occupies a larger volume and becomes less dense than the air surrounding it. Hence, the warm air rises and the cold air descends.
Which of these statements is true * warm air is heavier than cold air air exerts pressure air expands on cooling air moves from low pressure to high pressure?
Cold air exerts more pressure that warm air because the moloecules of cold air are huddled together closely making it denser where as in warm air, they are lighter and more dispersed. Denser air exerts more pressure compared to lighter air, hence cold air has more pressure.
What is dense and heavy and cold air is lighter and expands True or false?
Explanation: Hot air is lighter than cold air and rises in the atmosphere. On the other hand cold air is dense and heavy. We see this phenomenon during land breeze and sea breeze.
Why cold air is heavy?
The absorbed energy makes the molecules in air move and expand, therefore decreasing the airs density. The opposite is true for cold air. It is more dense because the molecules are closer together and they are closer together because the bonds are absorbing less energy and therefore do not move as much.
Why does warm air rise up * 1 Point A it is heavier than cold air B it is lighter than cold air C warm air occupies less space than cold air d none of these?
When air is heated, kinetic energy of air molecules increases and the average distance between then increases. Hence, air expands and becomes less dense than the air around it. Therefore, we can say that the warm air is lighter than cold air.
Is lighter than cold air?
Warm air is lighter than cold air. Because the cold air contains some of the molecules of water. But warm air doesn't contains any water droplets or dust particules. So warm air is lighter than cold air.
Which air is heavier dry or wet?
Wet airWet air is heavier than dry air because wet air contains water droplets in form of moisture so its density increases than that of dry air which is free from moisture.
Answer
Take two paper bags of the same size and hang them in inverted position on the two ends of a wooden stick. ... Place a burning candle below one of the bags. The bag above the candle goes up, as the air above the candle becomes warm, it rises, and pushes the bag up.
New questions in Physics
in compound microscope objective lens has (a) short aperture and short focal length (b) large aperture and short focal length (c) large aperture and l …
Answer
Answer. Take two paper bags of the same size and hang them in inverted position on the two ends of a wooden stick. ... Place a burning candle below one of the bags. The bag above the candle goes up, as the air above the candle becomes warm, it rises, and pushes the bag up.
New questions in Science
What usually happend when the narrator read out the story from the magazine to her grand mother ?
Why blow a balloon up?
Blow the balloon up to stretch it and help make it more flexible and let the air out.
What is happening?
When the air inside the plastic bottle is warmed, it expands and needs more space, therefore it stretches out the balloon. When the bottle is transferred to the icy cold water, the air is cooled; it contracts and needs less space, so the balloon deflates. The mass of air remains constant inside the bottle, so this shows that the warm air requires more space and is less dense than cool air.
Why is science important for kids?
Science activities and experiments are a great opportunity to make connections between real life experiences such as the hot air balloon ride. It encourages children to ask questions and promote scientific thinking such as making predictions, observations, comparison, reasoning, data gathering, experimentation and evaluation.