Goggles are personal Protection Equipment. (PPE). They are used to protect your valuable eyes.
Science labs contain many dangers that can get into your eyes and damage them irrepairably.
Chemical splashes can get into your eyes, as well as glass from exploding equipment, such as test tubes and flasks, especially when heating.
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Googles are needed in science labs in case of explosions.
to protect your eyes
All safety goggles are used to protect the eyes - that is obvious from the way they are designed and where you wear them on your body.
the function of goggles is to protect the eyes from harmful substances.
During labs the chances for eyes to be exposed to acids, bases, corrosives, and other harmful chemicals is high so goggles can help prevent splattering solutions or chemical particles from going directly into the eyes. Also the goggles help protect the eyes from broken glass and other shrapnel that could occur due to small explosions.