/kloc-how many days can I put balloons in the weather below 0/0 degrees?

An ordinary balloon is a day, it will explode when it is hot, deflate when it is cold, and then the rubber will get tired. If you prepare in advance, you can only prepare for one night and use it early the next day. If it is a hydrogen balloon, it will be miserable.

I have to get up early to prepare plastic balloons, which are sold in hospitals, parks and other places. They can be used for a long time, but they will sink. They are all filled with hydrogen.

Introduction to balloon release:

Helium balloons can last about 4-5 hours at room temperature. The time that helium balloons can be kept is affected by temperature. If the temperature is low, they can be kept for a long time, for example, in an air-conditioned room for about 7 hours.

Helium balloons should avoid sunlight as much as possible, and the life of helium balloons will be greatly reduced after sunlight. Helium has a small molecular weight and strong permeability, which will leak from the molecular gaps of balloons and generally cannot last for a long time.

Everything has a principle that it expands when heated and contracts when cooled, plastic products. It will become hard and brittle at low temperature. If there is water, put a layer of ice on it. It is easier to damage the material. When it is cold, the elasticity of matter becomes very small. Toughness will also decrease. So it is not suitable for balloon modeling when it is cold.