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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 ...
The pH range is commonly given as zero to 14, but a pH value can be less than 0 for very concentrated strong acids or greater than 14 for very concentrated strong bases. [2] The pH scale is traceable to a set of standard solutions whose pH is established by international agreement. [3]
Le Quy Don Technical University (Vietnamese: Đại học Kỹ thuật Lê Quý Đôn), also known as Military Technical Academy (Học viện Kỹ thuật Quân sự), [1] was founded in 1966 and is one of the national key universities in Vietnam. Le Quy Don Technical University has developed into an open, multidisciplinary, research-oriented ...
The tree professional used a type of meter called a Luvcosy Soil pH Meter, which claims to use "double-needled probe made of stainless steel"; the probes are ~2.2 cm apart. This type of probe material is not mentioned in the article.
Từ điển bách khoa Việt Nam (lit: Encyclopaedic Dictionary of Vietnam) is a state-sponsored Vietnamese-language encyclopedia that was first published in 1995. It has four volumes consisting of 40,000 entries, the final of which was published in 2005. [1] The encyclopedia was republished in 2011.
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 Ministry of Science and Technology (MOST, Vietnamese: Bộ Khoa học và Công nghệ) is a government ministry in Vietnam responsible for state administration of science and technology activities; development of science and technology potentials; intellectual property; standards, metrology and quality control; atomic energy, radiation and nuclear safety.
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