The most likely the basis for the teacher's warning can be the lab group has not labeled all the flasks that contain liquid because it can cause the big damage and its also can be harmful situation.
Damage is any modification with something a physical object—that leads it to lose some of its original strength. A accepted definition of it is "substantial changes to a system that negatively affect its present or future performance." Damage "does not always mean total system functional loss, merely that the computer is no longer operating at its best." Physical damage, often described as "the progressive physical phenomenon by which they fail," includes mechanical stress, which weakens a structure even when it is not instantly obvious.
Since all physical damage starts at the atomic level the with stretching or breakage of atomic bonds, the suppleness of these bonds has a massive effect on how quickly deterioration to any physical thing occurs.
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