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So that none of the substance slops out or spills between the fling process and further along the machinery system when the cover is attached. Keeps the machinery clean and doesn't waste product.

OR

If you're looking at this scientifically, by leaving a space at the top the liquid would have space to expand. Say it's put in hot temperatures, if there's no space at the top the particles in the liquid will move faster=moving further apart=increase in volume of liquid/expansion of volume of liquid

If you don't leave the space the liquid will expand and have no room for expansion. With this pressure the jar will break resulting in an avoidable mess.

There is also settling of the product during shipping which creates more space.

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14y ago
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13y ago

If it freezes, it will expand - get larger. So in order to not break open the bottle, the freezing water will expand into the empty space.

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6y ago

To allow for the liquid to contract or expand - due to temperature fluctuation during storage.

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14y ago

so you don't spill it when you open it

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Q: Why is there air above a liquid in a can or bottle?
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Continue Learning about Natural Sciences

Is there air in a glass thermometer?

Yes, above the mercury or the other liquid.


A bottle is filled up to its brim with a liquid The bottle is then tightly corked and placed in a freezer As the liquid freezes the bottle cracks The liquid could be?

water


Does freezing a water bottle make the outside of it wet?

Not exactly.The water that appears on the outside of the icy bottle is condensation of the water vapor in the air around the bottle. The cold temperature of the ice in the bottle causes the condensation. There are lots of water molecules in air -- there is more water in the air on a humid day then on a hot dry day, but there is always some water in the air. When air is cooled by coming in contact with the icy bottle, it condenses, and goes from being a gas to being a liquid (just like how steam turns back into water when it cools). It is the condensed water from the air that makes the outside of the bottle wet.If a cold bottle was in air that had no water vapor in it (unlikely except in a laboratory), then it would not get wet.


What happenes when liquid is exposed to air?

When liquid is exposed to air, it tends to evaporate. This happens because the molecules are in constant motion, and from time to time, a molecule achieves sufficient energy to overcome the atmospheric pressure above the liquid, and it escapes as a vapor.


Where does the water outside a water bottle come from?

If you mean the condensation on the shiny surface of the bottle soon after you've filled it, then it's the cold surface cooling the air around it causing that part of the air to be able to hold less moisture vapour, and this vapour condenses out as liquid. Once the bottle has warmed to the natural air temperature this won't happen any more.

Related questions

Why is there a mist over the neck of the bottle when you open a chilled bottle of lemonade?

Any liquid left in a container will evaporate. When placed in a closed container, there will be an equilibrium between the liquid and its vapour present above the liquid. When the bottle is chilled, the falling temperature causes the vapour present above the liquid to condense to form liquid again which appears as mist on the inside of bottle.


Why a sealed bottle partially filled with a liquid can float in a basin of the same liquid?

That depends on what fills the remainder of the bottle. If it is air, the average density of your bottle will be less than the density of the liquid.That depends on what fills the remainder of the bottle. If it is air, the average density of your bottle will be less than the density of the liquid.That depends on what fills the remainder of the bottle. If it is air, the average density of your bottle will be less than the density of the liquid.That depends on what fills the remainder of the bottle. If it is air, the average density of your bottle will be less than the density of the liquid.


Is an empty bottle really empty?

Where is the bottle? There are droplets so it is not empty. An empty bottle is empty of liquid conent but it will have air in it.


Is an 'empty' bottle really empty?

Where is the bottle? There are droplets so it is not empty. An empty bottle is empty of liquid conent but it will have air in it.


Why do water droplets form outside the bottle?

Condensation - The surface of the bottle and the air just above it will be cool enough to allow condensation of the water vapor in the air onto the bottle's surface.


How do you know the air conditioner is going out?

you can either check that there is a smell if there is a liquid bottle in your air freshner than see if there is any liquid left


How do straws work?

Drinking liquid through a straw uses the invisible pressure of the atmosphere to move a column of liquid. The air all around us is under pressure, from the rest of the atmosphere above it pushing down. (This is about 15 pounds per square inch at sea level.) You are reducing the pressure at the top of the straw*. The air pushing down on the surface of the liquid will force the liquid up the straw. So you are technically not "pulling" the liquid, it is being "pushed" by the air.*When you suck on a straw, the diaphragm under your lungs drops down, reducing the pressure in your lungs. This reduces the pressure in your mouth and likewise at the top of the straw.Air Pressure ExperimentYou can show that the air has pressure by inhaling at the top of an empty plastic bottle (a two-liter soft drink bottle is perfect for this). The sides of the bottle will cave in as you remove air from the bottle.(see related question)


How do you make a vacuum bottle?

Fill it with steam and quickly close the water bottle. You want the bottle to be filled with steam. Next, put it in the freezer. The steam will turn into liquid and so there won't be any air (there still some air.)


Is there air in a glass thermometer?

Yes, above the mercury or the other liquid.


What happens when liquids are exposed to air?

It evaporates :)


Why does filling a plastic bottle with cold water cause moisture on the outside of the bottleg?

The dew point is the temperature at which vapor in the air will condense and turn into liquid. The dew point is determined by the air temperature, pressure and relative humidity. Consequently, when vapor in the air comes into contact with the edge of the bottle (which, if the water is cold, is below dew point) it condenses and forms liquid on the outside of the bottle.


What is the condensation of water?

turns from gas to liquid on a cooler surface then the air (eg, window, water bottle)