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Surgical Instruments are sterilized by heating them and ALCOHOL is used as disinfectant in cleansing the skin prior to an injection. Why are these methods effective against microorganisms ?

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JoeAphillips19
These methods are effective because microorganisms are small and most precautions will cill them but they can cause sickness if communicate into anothe humand body
Greenleafable
Usually bacteria cannot survive temperatures higher than 45 degrees Celsius, which is why surgical instruments are sterilized at the temperature of 100 degrees Celsius, just in case some of the bacteria manage to survive. Alcohol also clears your skin of microorganisms by dissolving their cell membranes leaving them exposed to the surroundings and their imminent death. 

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