What actually burns when solids or liquids are set on fire? ?

6. carly removed her watch and other jewelry, rolled up her sleeves, and properly washed her hands. which is the next step she should do to don her personal protective equipment? remove the mask by untying the lower string, then the top strings pick up the mask by the upper ties, trying not to touch the part that covers the face let the clean gown unfold by holding it directly in front of her pull the gown away from her shoulders, trying not to touch the inside of the gown