Vacuum packing preventing the evaporation of volatile components. It is also commonly used to store dry foods over a long period of time, such as cereals, nuts, cured meats, cheese, smoked fish, coffee, and potato chips (crisps). On a more short term basis, vacuum packing can also be used to store fresh foods, such as vegetables, meats, and liquids, because it inhibits bacterial growth. Vacuum packing greatly reduces the bulk of non-food items. For example, clothing and bedding can be stored in bags evacuated with a domestic vacuum cleaner or a dedicated vacuum sealer. This technique is sometimes used to compact household
Square packing in a square 7, 8, 10, 14, 15, 24, and 35. The table below shows the optimal value of "a" for , with some example packings. Other results that do not establish exact optimal packings are known. For example: Square packing in a square Square packing in a square is a packing problem where the objective is to determine how many squares of side 1 (unit squares) can be packed into a square of side "a". If "a" is an integer, the answer is "a", but the precise, or even asymptotic, amount of wasted space for non-integer "a" is an open question. The