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A pH meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as pH. [2]
A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually or spectroscopically by changes in absorption and/or emission properties. [1] Hence, a pH indicator is a chemical detector for hydronium ions (H 3 O +) or hydrogen ions (H +) in the ...
According to historian Nguyễn Đình Đầu, [3] [4] the trường xích and điền xích were both equal to 0.4664 metres (1 ft 6.36 in), while according to Phan Thanh Hải, [5] there were three main thước: the thước đo vải, from 0.6 to 0.65 metres (2 ft 0 in to 2 ft 2 in); the thước đo đất ("ruler for measuring land"), at ...
The measurement of pH can become difficult at extremely acidic or alkaline conditions, such as below pH 2.5 (ca. 0.003 mol/dm 3 acid) or above pH 10.5 (above ca. 0.0003 mol/dm 3 alkaline). This is due to the breakdown of the Nernst equation in such conditions when using a glass electrode.
The Hàn River (Vietnamese: sông Hàn (滝瀚)) is a river entirely located in the city of Da Nang, Vietnam. It is formed where the Cẩm Lệ and the Đò Toản join on the tripoint of the Da Nang city districts Cẩm Lệ , Ngũ Hành Sơn , and Hải Châu [ 1 ] and empties into the Da Nang Bay .
[5] [6] The rebellion of Đinh Điền and Nguyễn Bặc was quickly put down by Lê Hoàn but in the north, the Song dynasty began an invasion of Đại Cồ Việt in profiting its chaotic situation after the death of Đinh Tiên Hoàng, [6] finally Dương Vân Nga and the general Phạm Cự Lượng with the agreement from the majority of ...
The Vietnamese Wikipedia initially went online in November 2002, with a front page and an article about the Internet Society.The project received little attention and did not begin to receive significant contributions until it was "restarted" in October 2003 [3] and the newer, Unicode-capable MediaWiki software was installed soon after.
The Vietnam Academy of Science and Technology (VAST; Vietnamese: Viện Hàn lâm Khoa học và Công nghệ Việt Nam) is the largest and most prominent research institute in Vietnam. It was founded on 20 May 1975 as the Vietnam Academy of Science, then subsequently assumed its current name in 2008.