Why does a pine nut explode when it flies into the sky?

Because the hydrogen balloon is full of hydrogen. Although hydrogen is a clean energy source, it is extremely dangerous, and a slight bump in transportation will cause hydrogen explosion. The balloon wall has a certain expansion limit, and the balloon filled with hydrogen will be subjected to less and less atmospheric pressure in the rising process, which makes the hydrogen pressure in the balloon greater than atmospheric pressure and the balloon expands. When the expansion degree of the balloon is greater than the expansion limit of the balloon wall, it will explode.

The main component filled in a hydrogen balloon is hydrogen, and a hydrogen molecule has two hydrogen atoms. The mass of hydrogen atoms is quite small, so the density of hydrogen is far less than that of air, only a quarter of that of air. This is the reason why hydrogen balloons can successfully carry people to the sky.

Hydrogen balloons are very different from the hot air balloons we usually take. Hot air balloon mainly reduces the air density by heating the air, making it one-third of the air density, thus achieving the purpose of taking off. As early as the18th century, when the French papermakers Montgomerie brothers were warming themselves by the fire, they were inspired by the pieces of paper rising from the fire. They chose to use paper bags to collect hot air for experiments and found that paper bags would rise with the airflow. So1On June 4th, 783, the Mongofels gave a public performance in Annone Square in Lyon. In the same year, the Mongerfield brothers made the world's first manned flight in Fort Muitt.

But hydrogen balloons are different from hot air balloons after all, and hydrogen is extremely dangerous. In the process of hydrogen production, because it is not pure enough, it may explode, not to mention that it is so bumpy and the air pressure changes so rapidly, so it is absolutely impossible to fly in a hydrogen balloon.