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to close the water inlet after the cistern is full

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Q: Why is there a filled plastic bottle inside the flushing cisterns?
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Related questions

What happens when you put a filled bottle of water to an open flame?

If the bottle is from glass will burst soon; the plastic container will be melted.


Does plastic have oxygen in it?

no you tool it doesn't. unless of course it is a bottle and it was filled with oxygen? Yes it does...


Why does an empty plastic bottle floated while the bottle filled with water sank?

Since air is less dense than water, the air pushes the bottle upward. The water filled bottle would sink because the density is greater than water.


A Cartesian diver made from a plastic bottle filled with water and an inverted test tube partially filled with water What causes the diver to sink as the bottle is squeezed?

"The volume of air in the diver decreases."


How many calories are in a 40 oz water bottle?

It depends on with what you fill the bottle. If the bottle is filled with water, then 0 calories are inside the bottle. As for the bottle itself, I have to recommend not consuming the plastic and getting your calories elsewhere.


The picture shows a Cartesian diver made from a plastic bottle filled with water and an inverted test tube partially filled with water. What causes the diver to sink as the bottle is squeezed?

The volume of air in the driver decrease.


Is there a area of ocean tat is filled with plastic bottles?

yes. it's called the bottle-nosed dolphin sea


What do you add to a plastic bottle filled with cola that weighs one liter to it to make it weigh less than two ounces?

Air


What is the past of fill?

Filled. For example, I filled the bottle.


Why does a plastic bottle filled completely with water and capped tightly burst open when left in the freezer overnight?

The water expanded when turned into ice. As there was no air space in the bottle, the plastic failed under the pressure.


What happens when you put a filled plastic water bottle in an open fire?

In the first place the water in the bottle would keep the temperature of the plastic down preventing it from burning and leaking, The same as you would do by boiling water over a flame in a paper cup, However the water in the bottle would heat up and eventually the pressure inside the bottle would burst it like a balloon.


Is water kept in plastic bottles suitable for drinking?

Are we talking water that has been bottled and distributed or are we talking about you filling up a bottle yourself? Bottled waters are filled under sanitary conditions. They should be pretty much okay as long as they remain sealed. Water stored in plastic can acquire some plastic taste to them. If they weren't filled under sanitary conditions, bacteria can build up and cause severe health problems.