air should be removed before filling hot water bag.
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Answer:
Filling a bottle with boiling water can cause splash back, which may cause burns. ... ALWAYS expel air from the bottle by lowering it carefully onto a flat surface until the water appears at the opening.
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Explanation:
Filling the bottal with boiling water can cause splash back ,Which may cause burn and Always expel the air from the bottle by lowering it carefully into a flat surface until the water appears at the opening
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