crack - a thin line that appears that shows that something is broken., film - a very thin layer of something on a surface., minimize - make a quantity as small as possible, preassure - the force that a liquid or gas makes when it is inside a closed area, surface tension - the natural force a liquid has that holds it together where it meets the air., rigid - unable to change shape or position., mechanically stable - unlikely to change shape or break because it has a strong structure,

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