Why does a crushed bottle weigh less than a bottle with air?

The barometric pressure that is pressing on your body right now is caused by the mass of the atmosphere being affected by gravity. As you move up through the atmosphere, there is less mass between you and the vacuum of space, so the air is less dense and weighs less.

Does a plastic bottle of fresh water sink or float in the ocean?

Half of the plastic waste in the ocean consists of floating plastic 1, such as plastic bags and bottlecaps. The rest is denser than seawater, so it sinks 2.

Why does an empty plastic bottle float on water while a plastic bottle sinks?

An empty plastic bottle has air inside it which means that it reduces its density due to which it is able to float over water. In other words, its density is less than the density of water due to which reason it floats.

Why does a plastic bottle filled with air change its size when the temperature changes?

It’s simply the expansion of air trapped in the bottle and the balloon. Air expands when it is heated; it spreads out and either fills a larger space or raises the pressure in a closed space.

Does air make you weigh more?

No. An air mattress weigh more when it’s full of air.

What types of plastics float?

HDPE (high density polyethylene), LDPE (low density polyethylene), and PP (polypropylene) which make up containers and plastic bags for example do float, as their density is less than that water.

Why do some plastics float?

Plastic that is less dense than seawater will float at the surface, while plastic that is denser than seawater will sink to the ocean floor. However, the density of seawater increases with depth, so plastic could have a density that allows it to remain suspended within the water column.

Why do plastic bottles float on Class 9?

Density is defined as mass per unit volume. Density of plastic is less than that of water, hence empty plastic bottle floats over water surface.

Why does an empty can float in water?

Objects will sink in water if their density is greater than 1 g/mL. The cans of diet pop are less dense than water, so they float. The cans of regular pop are more dense than water so they sink.

Why does the bottle change its shape?

The air expands caused by increased temperature. After closing the bottle, the air cools down and decreases volume, creating a vacuum, which collapses the bottle.

Why do plastic bottles expand?

When air is heated, it expands. As the product cools, the contents and/or the air in the headspace contract, creating a negative pressure within the bottle. This negative pressure can cause the side panels to suck in to compensate for the loss of product volume.

What happens to the volume of a bottle on a plane?

The pressure inside the bottle will try to equalise and the way this is achieved is for the volume to expand. Because your bottle is sealed, the number of moles of air inside the bottle is constant. Assuming the temperature on the plane is kept at roughly ground level temperature, you can see how pressure and volume behave.

What is the atmospheric pressure inside of a bottle?

As you know the atmospheric pressure is 1 bar. This means if you have an open bottle, the pressure inside is the same as outside which is 1 bar. Also, if you close that bottle, the pressure inside the bottle will again be 1 bar. Now lets take the air out of that bottle.

What happens to the volume of a water bottle at high altitude?

When you increase the altitude (such as on a plane) the air pressure decreases to less than one atmosphere, but the pressure of air inside the bottle is still at one atmosphere (ie higher pressure). The pressure inside the bottle will try to equalise and the way this is achieved is for the volume to expand.

Why does the height of a bottle affect its density?

Which in turn means that a denser liquid wants to be lower, and a wider container needs to be filled less. However, for a given mass, this is proportional to the sqrt of the height, so stretching your bottle taller means you can get away with more mass in the bottom, but its nonlinear. As increases, so does the height.