All liquids and and gases have pressure. Pressure is also a force but does not depend on area it acts. Pressure is arising from its own weight. The molecules in liquids and solids areattracted downward due to earth's mass(gravitational force). The impact of this gravitational force per unit area is the pressure. if there is a liquid or gas there must be pressure. the magnitude of pressure inside a plastic bottle depends on the weight of the air in it.
Actually, an empty sealed bottle should expand slightly as altitude increases. At the altitude where the bottle is sealed, the air pressure outside the bottle is equal to the air pressure inside the bottle. When the bottle is transported to a higher altitude, the air pressure inside the bottle is greater than the air pressure outside the bottle (In other words: There are more air molecules per unit volume inside the bottle than outside). The increased air pressure inside the bottle relative to the outside pressure causes the bottle to expand slightly. An empty bottle would not collapse as altitude increases.
When an empty plastic bottle is left open to the atmosphere the air pressure outside and inside the bottle are in equilibrium (does not always mean they are equal, but in this case they are equal). This means that whatever force exerted by the atmosphere on the outside of the bottle is balanced by a force from the inside of the bottle. When one sucks the air out of the bottle one removes the source of pressure and forces within the bottle. The pressure differential between air outside and inside bottle is enough to cause the bottle to collapse.Note that this will not happen so easily with glass bottles because even when one tries to suck all the air out of them, they also experience a tendency to collapse, but their structure is strong enough to withstand the pressure differences.
When you pour in the hot water, it takes up all of the space inside the bottle (since it is a fluid). When you pour out the hot water and quickly put on the cap the air pressure inside the bottle is less than the air pressure outside causing the bottle to implode on itself. I'm not really sure about pouring cold water on after, maybe someone knows the answer to that part. But if you try doing it you can probably figure out what the answer is! Actually: When you pour the hot water in, and then out of the bottle the air that rushes in to replace the water is warmed by the water, and the warmed sides of the bottle, causing it to expand and some air leaves the bottle. When you then cap the bottle and let it cool to room temperature the air inside contracts, but because the cap is on no air can get back in to even things out. This causes the pressure inside the bottle to drop. Because the outside air pressure is higher than that inside the bottle, the bottle will chrush in, if it is plastic, until the bottle is small enough that the two pressures are equal. Pouring cold water on the bottle just amplifies the contraction of the air inside the bottle causing an even more pronounced effect. Note that this can be hazardous if you use glass, because the glass will not bend or crush but appear normal until the pressure difference gets to high and the glass simply implodes all at once.
It will become vacuum sealed, and opening the bottle will cause a sudden release of low pressure, where higher pressure air from it's surroundings is 'sucked' into the bottle, equalizing the pressure.
No, because the plastic is flammable.
When you crush a plastic bottle, you decrease the volume inside the bottle. This increase in pressure (due to the decrease in volume) is what makes the bottle crush. The atmospheric pressure outside the bottle remains constant, causing the bottle to collapse under the increased pressure inside.
When you suck air out of a bottle, you decrease the air pressure inside the bottle. The higher air pressure outside the bottle then pushes the walls of the bottle inwards, causing it to shrink. This is due to the difference in air pressure inside and outside the bottle.
Basically, its from the suction from the person drinking it. actually its form the external air pressure crushing it as you remove air from the inside, if you leave a small gap as you smoke this will not happen. it is important to remember you are only removing the equalising air form the bottle, it is the inequality that makes vacuumed bottles crush and shaken soda bottles expand as they have higher air prssure than the outside, check you physics mate
Unopened water bottles collapse due to changes in air pressure. When the air pressure outside the bottle is higher than the pressure inside, the bottle can collapse as the external pressure pushes in on the bottle, causing it to shrink.
When the temperature of a confined sample of gas is reduced, the pressure is reduced. Just before you cover the bottle, the steam in it has the same pressure as the air outside the bottle. (If the steam momentarily had higher pressure, some of it ran out. If the steam momentarily had lower pressure, some air ran into the bottle.) After you cover the bottle, nothing can get in or out of it. Then you cool the steam. The pressure inside drops when the steam cools. Now the pressure of the air outside the bottle is higher than the pressure inside the bottle, and the higher pressure outside crushes the bottle. ================================================ Do you REALLY want to see something cool, and shock the other people in the house ? Take the same plastic bottle, boil some water, pour some of the boiling water into the plastic bottle, and when the bottle is full of steam, cover it up tight. Watch the water in the bottle. As soon as it STOPS boiling, shove the bottle into a dish of ice. The water inside will START boiling again ! From the explanation above, you should be able to explain this. Here's a hint: Water boils at a lower temperature when there's less pressure on top of it. Boiling water in Denver is not as hot as boiling water in Brawley, California, because Denver is at higher altitude. so the air pressure there is lower.
When you put an empty plastic bottle in the freezer, the air inside the bottle will cool and contract, causing the bottle to collapse or deform. This is due to the decrease in air pressure inside the bottle as it cools down.
A bottle can collapse if there is a significant change in pressure inside the bottle compared to the pressure outside, causing the walls of the bottle to buckle inwards. This can happen if the bottle is not able to withstand the pressure differential, or if it is made of a weak material. Additionally, extreme temperatures or physical impacts can also cause a bottle to collapse.
When the water in the bottle is cooled, it contracts and creates a lower pressure inside the bottle. The higher atmospheric pressure outside the bottle pushes the water up through the straw to equalize the pressure, causing the water level in the straw to rise.
When the air is removed from a bottle, the external air pressure becomes greater than the pressure inside the bottle, causing the bottle to collapse. This is because the air pressure on the outside is strong enough to compress the bottle's walls, leading to its collapse without the internal pressure to counterbalance it.
Actually, an empty sealed bottle should expand slightly as altitude increases. At the altitude where the bottle is sealed, the air pressure outside the bottle is equal to the air pressure inside the bottle. When the bottle is transported to a higher altitude, the air pressure inside the bottle is greater than the air pressure outside the bottle (In other words: There are more air molecules per unit volume inside the bottle than outside). The increased air pressure inside the bottle relative to the outside pressure causes the bottle to expand slightly. An empty bottle would not collapse as altitude increases.
The increased pressure would compress the air inside the bottle, causing it to shrink in size. Eventually, the pressure would equalize between the air inside the bottle and the surrounding water, and the bottle may collapse under the immense pressure.
We have to assume that the lid does not allow air to enter the plastic bottle. When the water is hot, the air above the water is also hot. When the air cools down, its volume decreases significantly. This, in turn, causes the pressure in the bottle to decrease such that atmospheric pressureis greater than the pressure inside the bottle. This causes the bottle to contract since the force exerted on the bottle due to atmospheric pressure is greater than the force exerted on the bottle due to the air pressure inside the bottle. The volume of the bottle decreases until the pressure of the air inside becomes equal to atmospheric pressure. The changes in volume, pressure and temperature can be explained by the equation pV=nRT, where p:pressure of gas V:Volume occupied by gas n:number of moles of gas R:molar gas constant T:Thermodynamic temperature of the gas