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2. Water softening - Wikipedia

   en.wikipedia.org/wiki/Water_softening

   Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water. The resulting soft water requires less soap for the same cleaning effort, as soap is not wasted bonding with calcium ions. Soft water also extends the lifetime of plumbing by reducing or eliminating scale build-up in pipes

3. Fabric softener - Wikipedia

   en.wikipedia.org/wiki/Fabric_softener

   A fabric softener (American English) or fabric conditioner (British English) is a conditioner applied to laundry after it has been washed in a washing machine. A similar, more dilute preparation meant to be applied to dry fabric is known as a wrinkle releaser .

4. List of viscosities - Wikipedia

   en.wikipedia.org/wiki/List_of_viscosities

   One of the key predictions of the theory is the following relationship between viscosity , thermal conductivity, and specific heat : k = f μ c v {\displaystyle k=f\mu c_{v}} where f {\displaystyle f} is a constant which in general depends on the details of intermolecular interactions, but for spherically symmetric molecules is very close to 2. ...

5. Drinking water quality in the United States - Wikipedia

   en.wikipedia.org/wiki/Drinking_water_quality_in...

   Under the LCR, if tests show that the level of lead in drinking water is in the area of 15 ppb or higher, it is advisable—especially if there are young children in the home—to replace old pipes, to filter water, or to use bottled water. EPA estimates that more than 40 million U.S. residents use water "that can contain lead in excess of 15 ppb".

6. Alcohol measurements - Wikipedia

   en.wikipedia.org/wiki/Alcohol_measurements

   Called a "Commercial Quart" because it was equivalent to 0.8 US fluid quarts. Replaced by the 750 mL "metric quart". Reputed Quart (UK) 25.6 US fl oz: 26.66 imp oz. 757 mL: The "Reputed Quart" (2 ⁄ 3 Imperial quart or 1 ⁄ 6 Imperial gallon) was devised to split a standard gallon into six large bottles and was usually used for wine and ...