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Beckman Model M pH Meter, 1937 [1] Beckman model 72 pH meter, 1960 781 pH/Ion Meter pH meter by Metrohm. 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 ...
Originally, many thước of varying lengths were in use in Vietnam, each used for different purposes. According to Hoàng Phê (1988), [1] the traditional system of units had at least two thước of different lengths before 1890, [2] the thước ta (lit. "our ruler") or thước mộc ("wooden ruler"), equal to 0.425 metres (1 ft 4.7 in), and the thước đo vải ("ruler for measuring ...
Từ điển bách khoa toàn thư Việt Nam (Encyclopedia of Vietnam), a state-sponsored encyclopedia which was published in 2005. Vietnamese Wikipedia, a project of the Wikimedia Foundation. Vietnam War encyclopedias. Encyclopedic works and encyclopedias focused on Vietnam War-related topics.
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.
On October 27, 1976, the SRV Prime Minister issued a decision to establish Thu Duc University of Technical Education on the basis of Thu Duc College of Education. This was amalgamated with Thu Duc Industrial Vocational School in 1984 and further merged with Technical Teacher Training School No.5 in 1991 to become the present Ho Chi Minh City ...
These are Lang Son, Son La, Hoa Binh, Bac Ninh and Hai Duong in the North, Vinh in the Centre, as well as Tra Vinh, Soc Trang and Can Tho in the Mekong Delta. In 2010 the province of Soc Trang has been the first to enact a sewer tariff that is designed to recover the costs of operation and maintenance.
The Ho Chi Minh City University of Science (HCMUS; Vietnamese: Trường Đại học Khoa học Tự nhiên, Đại học Quốc gia Thành phố Hồ Chí Minh; formerly known as University of Sciences), or VNU-HCM University of Science, offers scientific degrees in Ho Chi Minh City, Vietnam It was established in 1941 as the Indochina College of Science.
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