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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 ...
The 13th Politburo of the Communist Party of Vietnam (CPV), formally the 13th Political Bureau of the Central Committee of the Communist Party of Vietnam (Vietnamese: Bộ Chính trị Ban Chấp hành trung ương Đảng Cộng sản Việt Nam Khoá XIII), was elected at the 1st Plenary Session of the 13th Central Committee (CC) in the immediate aftermath of the 13th National Congress.
The Central Committee of the Communist Party of Vietnam (Vietnamese: Ban Chấp hành Trung ương Đảng Cộng sản Việt Nam), commonly the Party Central Committee (PCC; Vietnamese: Ban Chấp hành Trung ương Đảng - BCHTW Đảng or BCHTƯ Đảng), is the highest organ between two national congresses and the organ of authority of the Communist Party of Vietnam, the sole ruling ...
The 13th Secretariat of the Communist Party of Vietnam (CPV), formally the 13th Secretariat of the Central Committee of the Communist Party of Vietnam (Vietnamese: Ban Bí thư Ban Chấp hành Trung ương Đảng Cộng sản Việt Nam Khoá XIII), was partly elected by the 1st Session of the 13th Politburo and partly elected by the 1st Plenary Session of the 13th Central Committee in the ...
Arnold Orville Beckman (April 10, 1900 – May 18, 2004) was an American chemist, inventor, investor, and philanthropist. While a professor at California Institute of Technology, he founded Beckman Instruments based on his 1934 invention of the pH meter, a device for measuring acidity (and alkalinity), later considered to have "revolutionized the study of chemistry and biology". [1]
Liang published Phan's 1905 work Việt Nam vong quốc sử (History of the Loss of Vietnam) and intended to distribute it in China and abroad, but also to smuggle it into Vietnam. Phan wanted to rally people to support the cause for Vietnamese independence; the work is regarded as one of the most important books in the history of Vietnam's ...
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 ...