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    				| 1. | 
                                    To set fire to a combustible substance, you have to heat it to a certain minimum temperature. What is the minimum temperature called? If this minimum temperature is very low for a certain substance, what is the substance called? | 
                            
| Answer» To set fire to a combustible substance, you have to heat it to a certain minimum temperature. What is the minimum temperature called? If this minimum temperature is very low for a certain substance, what is the substance called? | |