Spontaneous combustion is a slow process where decomposition and oxidation occur and heat builds up to a point where the items catch on fire (without the use of an external flame).
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Final Quiz and Certificate
Congratulations, you have almost finished the "Washing Machines" section. Take the final quiz by clicking on the link below. You need a minimum of 90% to pass (maximum 2 attempts). Once you have passed the quiz you can download a certificate for your records. Good luck!