It's a process called condensation caused by humid air striking a much colder surface. Generally the colder air is the less moisture it can carry. So when the air around you meets the side of the bottle it begins to cool, and can't care as much moisture as it had been. The moisture it can't carry is deposited on the side of the bottle as condensation.
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.
A bottle
When a cold water bottle is placed on a warmer surface, such as a bench, the air around the bottle cools down and cannot hold as much moisture, causing condensation to form on the outside of the bottle. This moisture then transfers to the bench, leaving a ring of moisture.
A wet cloth on the outside of a plastic bottle can help in evaporative cooling. As the water evaporates from the cloth, it takes away heat from the bottle, which can help to keep the filtered water inside the bottle cooler, particularly in hot climates.
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.
you get a plastic bottle
Warm air can hold more moisture (humidity) than cool air. Therefore, when the air cools off and the amount of moisture in the air is too high, some water separates out from the air. This is why dew falls on a cool summer night or we get a frost some winter evenings. The water bottle example is the same process, but smaller scale. The air cools off right next to the cold bottle, and cannot hold as much humidity. So, like dew on the ground, you get condensation ("sweat") on the outside of your water bottle.
When buying a bottle filling machine, one should first determine what will the bottle be filled with. Items such as liquids, dry goods such as pills and powders, will require a different type of bottle filling machine because of the viscosity of the materials. One may purchase a bottle filling machine by going to the site Kinnek and getting a quote.
Is it bad for you to reuse a plastic bottle
No, because the plastic is flammable.
A plastic bottle shape.
plastic