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Inflammables and their ignition from heat
The lecture explains that inflammable bodies not only emit heat and light when heated but sustain and intensify the heat under suitable conditions. It contrasts inflammables with other heated bodies that mainly diffuse heat and revert after melting. It notes that inflammables undergo permanent change, producing a continuing flame and heat while some material remains nonheating. Foundations for inflammation include sufficient heat and access to fresh air, with varying heat requirements by fuel type.