One of the most popular science curriculums on the market, Apologia has colorful and bright pages that kids will love. The upper grades are written in an easy to understand style, which comes in handy when learning subjects such as Chemistry or Biology. Dr. Wile (the author), takes special care in writing the curriculum for homeschooling students.
1 Tap is used in the British Isles and most of the Commonwealth for any everyday type of valve, particularly the fittings that control water supply to bathtubs and sinks.
A valve, usually installed in the lowest portion of a piping system or. vessel, that controls the flow of liquid from the system or vessel. Also called. drain valve. dual system. A situation in which a second plumbing system is installed along-. side the system for provision of drinking-water. An example is a potable. drinking-water system and a greywater system in the same facility. electrolysis.