Many of us, up to 1000 degrees a heated metal ball We think if it falls on something it will burn, right?

However on pineapple peel When you try something like that, you run into a very interesting situation…

Can we really say that pineapple peels are a super material? In our opinion, yes. It’s worth watching the video:

In the video you can see that the pineapple skin is barely damaged until the metal ball loses its orange shine. So how is this possible? Pineapple can actually be used to make armor A super material?

This situation is actually explained by the Leidenfrost effect, an interesting feature of heat transfer.

The effect does not only apply to pineapple, It can also be seen in some other fruits, such as watermelon. According to Seppo Louhenkilpi of the Department of Chemical Engineering at Aalto University, heat transfer is influenced by a factor known as the Leidenfrost temperature.

Above this temperature a surface is so hot that a vapour layer is formed when it comes into contact with liquid The liquid does not come into direct contact with the surface.

Where you may have seen this effect before when you drip liquid on a hot surface These are small balls that form. In the same way, if you put a very hot ball in water, the ball itself does not touch the water and a small bubble of steam is created.

We can say that for heat transfer this means: On surfaces above the Leidenfrost temperature The heat transfer rate does not change much. On surfaces below the Leidenfrost temperature, the relatively cooler hot surface can come into direct contact with the liquid and significantly increase the heat transfer rate.

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