1. A mask is used for the protection of the face and eyes in the laboratory.
2. A masking agent is a compound added to react with a specific other compound.
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A dust mask is a flexible mask with elasticated straps that is worn over the mouth and nose during activities in which there is a hazard of taking in dust. Common uses for dust masks are in building constrruction and cleaning activities such as sweeping etc.
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Graduated cyllinders are used to measure volumes of liquids, powders or fine granules.
beaker use as container for boiling liquids