Gas porosity

Okay, imagine you are making a cake. You mix all the ingredients together in a bowl and then put it in the oven to bake.

But sometimes when you take the cake out of the oven, you see little pockets of air inside. These pockets are like holes in your cake, and they are called gas porosity.

Gas porosity happens because there was air trapped inside the cake batter when you put it in the oven. When the heat started to bake the cake, the air inside got hot and expanded, creating those little pockets.

In the same way, when we make things out of metal or plastic, air can also get trapped inside. This can weaken the material and make it more likely to break or fail.

So, we need to be careful when making things to try and prevent gas porosity from happening. We can do this by making sure there is no air trapped inside the material before we start making it. Or, we can use special techniques to remove any air that might be trapped inside.

And there you have it, gas porosity is like little holes in a cake or a material, caused by air getting trapped inside and expanding when heated.