Definition of headspace
1 : the volume above a liquid or solid in a closed container The demonstrator suggests that the slow leakage of hydrogen from the balloons … allowed for the accumulation of hydrogen and oxygen in the bag's headspace. — Chemical and Engineering News To process sauce, immediately ladle hot sauce into hot, clean half-pint canning jars, leaving 1/4-inch headspace. — Better Homes and Gardens
2 : vertical space in which to stand, sit, or move : headroom The sleeping area [of a tiny house] looks restful and thanks to the curved roof, probably has more headspace than most …— Kimberly Mok
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showing great care, attention, and effort
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