សេចក្តីជូនដំណឹង
សេវាប្រឹក្សាយោបល់ផ្នែកជំនាញកសិកម្ម នៃអង្គការ NASTO សូមប្រកាសផ្អាកមួយរយៈពេលវែង ដោយគ្មានការកំណត់ អាស្រ័យហេតុនេះសូមសិក្ខាកាម និងមិត្តអ្នកអានទាំងអស់មេត្តាជ្រាបជាដំណឹង, សូមអរគុណ

Thursday, March 8, 2012

When My Dad Strikes a Match, Why Does a Flame Appear?


 A match is a special kind of invention for making fire. The idea is the same as the old trick of twirling a stick round and round while pressing its end into a rounded-out spot in another piece of wood. The friction make the end of the stick get hot. If some easy-to-burn stuff like wood shavings is right there, it could get hot enough to being burning.

The head of a match usually has a chemical, like potassium chlorate, and some charcoal or sulfur. The striking surface may have some red phosphorus and fine sand. The idea is to get heat by friction and have something there that is very easy to burn. That's a lot easier than the stick trick.

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