A dynamic map of ignition through the ordinary 5th battery and chewing gum packaging tin foil, caused a lot of netizens' attention in Weibo. In the dynamic image, the operator trims a piece of chewing gum wrapped in tin foil with scissors to form a narrow strip shape in the middle, and connects the tin foil to the positive and negative poles of a No. 5 battery, and then the middle portion of the tin foil burns quickly.

Recently, after conducting experiments, the reporter found that tin foil can be ignited by this method, but it is necessary to have multiple factors at the same time, which is difficult to achieve.

Expert statement

Short circuit phenomenon, heat generation, easy to burn, do not imitate

According to Mr. Sun, a member of the Science Squirrel Society and a professor of physics, in physics, the current flowing from the end of the power supply without flowing through the load directly back to the power supply has not passed through the electrical device to form a loop, which is called a short circuit. After a short circuit, the circuit quickly generates a large amount of heat and is released. He said that since the tin of the tin foil on the surface of the chewing gum is a conductor, it can conduct electricity and connect with the positive and negative poles of the battery to form a current loop. When the current passes through the conductor, the conductor generates a hot electric field, and after the heat is accumulated to a sufficient extent, the tin foil may burn when it reaches the ignition point.

In the experiment, although the battery voltages of different models are the same, due to their different capacities, the heat release is different, which affects the smoke change and ignition difference of the experiment. Professor Sun said that in this experiment, the voltage of the battery is fixed, and the heat and resistance of the material are inversely proportional. In order to increase the thermal energy accumulation of the tin foil, the cross-sectional area can be increased and the electric resistance can be reduced. Due to the influence of wind that cannot be excluded in the experimental environment, increasing the area will also increase the heat dissipation rate. Therefore, simply increasing the area does not directly affect the ignition probability.

Professor Sun suggested that due to the short circuit, a large amount of heat will be generated, which may cause burns. Please do not blindly follow suit.

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