Final answer:
Testing a substance for flammability involves burning it to determine if it is easily ignited and can sustain a fire.
Step-by-step explanation:
Testing a substance for flammability involves changing the substance by burning it. This process helps determine if the substance is flammable, meaning if it can catch fire and burn easily. By observing how the substance reacts when exposed to heat or a flame, we can assess its level of flammability and take necessary precautions.
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