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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]
For example, if the concentration of the conjugate base is 10 times greater than the concentration of the acid, their ratio is 10:1, and consequently the pH is pK a + 1 or pK b + 1. Conversely, if a 10-fold excess of the acid occurs with respect to the base, the ratio is 1:10 and the pH is pK a − 1 or pK b − 1.
When an acid is dissolved in water, the pH will be less than 7, while a base, or alkali, will have a pH greater than 7. A strong acid, such as hydrochloric acid, at concentration 1 mol dm −3 has a pH of 0, while a strong alkali like sodium hydroxide, at the same concentration, has a pH of 14. Since pH is a logarithmic scale, a difference of ...
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 ...
Former Deputy Prime Minister Vu Duc Dam at the founding ceremony of University of Medicine and Pharmacy, November 18, 2020. [1]On May 20, 2010, Prof. PhD. Mai Trong Nhuan (Former Director of VNU-HN) signed Decision to establish the School of Medicine and Pharmacy - Vietnam National University - Hanoi.
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.
Nguyễn Thái Học, founder and leader of the VNQDD, 1930. Nguyễn Thái Học (Vietnamese pronunciation: [ŋwiən˦ˀ˥ tʰaːj˧˦ hawk͡p̚˧˨ʔ]; chữ Hán: 阮 太 學; 1 December 1902 – 17 June 1930) was a Vietnamese revolutionary and independent activist who was the founding leader of the Việt Nam Quốc Dân Đảng, namely the Vietnamese Nationalist Party.
Nguyễn Thị Ánh Viên (born November 9, 1996, in Cần Thơ) [1] is a Vietnamese swimmer. She swam for Vietnam at the 2016 Olympics.At the 2014 Asian Games, she won Vietnam's first-ever medal in swimming. [2]