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2. Coupon collector's problem - Wikipedia

   en.wikipedia.org/wiki/Coupon_collector's_problem

   In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: if each box of a given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more than t boxes need to be bought ...

3. Purified water - Wikipedia

   en.wikipedia.org/wiki/Purified_water

   Sea-water is typically 5 S/m, drinking water is typically in the range of 5-50 mS/m, while highly purified water can be as low as 5.5 μS/m (0.055 μS/cm), a ratio of about 1,000,000:1,000:1. Purified water is used in the pharmaceutical industry. Water of this grade is widely used as a raw material, ingredient, and solvent in the processing ...

4. List of bottled water brands - Wikipedia

   en.wikipedia.org/wiki/List_of_bottled_water_brands

   This is a list of bottled water brands. Bottled water is drinking water (e.g., well water, distilled water, mineral water, or spring water) packaged in plastic, cartons, aluminum, or glass water bottles. Bottled water may be carbonated or not. Sizes range from small single serving bottles to large carboys for water coolers. The environmental ...

5. Properties of water - Wikipedia

   en.wikipedia.org/wiki/Properties_of_water

   Water is the chemical substance with chemical formula H. 2O; one molecule of water has two hydrogen atoms covalently bonded to a single oxygen atom. [25] Water is a tasteless, odorless liquid at ambient temperature and pressure. Liquid water has weak absorption bands at wavelengths of around 750 nm which cause it to appear to have a blue color. [3]

6. Residential water use in the U.S. and Canada - Wikipedia

   en.wikipedia.org/wiki/Residential_water_use_in...

   Residential water use (also called domestic use, household use, or tap water use) includes all indoor and outdoor uses of drinking quality water at single-family and multifamily dwellings. [2] These uses include a number of defined purposes (or water end uses) such as flushing toilets, washing clothes and dishes, showering and bathing, drinking ...

7. Water supply - Wikipedia

   en.wikipedia.org/wiki/Water_supply

   By 2015, 5.2 billion people representing 71% of the global population used safely managed drinking water services. As of 2017, 90% of people having access to water from a source that is suitable for drinking – called improved water source – and 71% of the world could access safely managed drinking water that is clean and available on-demand ...