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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]
This category contains articles about pH indicators: chemical compounds which change colour or fluorescence in response to changes in pH Wikimedia Commons has media related to PH indicators . Subcategories
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 ...
Nguyễn Hải Dương (born in Phong Điền District in Thừa Thiên Huế province on 15 April 1943) pen name and political name Nguyễn Khoa Điềm is a Vietnamese poet and government literary official. [1] [2] [3] He graduated from Hanoi National University of Education. [4] His work is included in the book, Six Vietnamese Poets. [5]
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.
In South Vietnam, a referendum was scheduled for 23 October 1955 to determine the future direction of the south, in which the people would choose Diệm or Bảo Đại as the leader of South Vietnam. [60] Diem, with the support of his brother Ngô Đình Nhu and the Cần Lao Party, used an avid propaganda campaign to destroy Bảo Đại's ...
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.
Following the increasing of Internet usage in Vietnam, many online encyclopedias were published. The two largest online Vietnamese-language encyclopedias are Từ điển bách khoa toàn thư Việt Nam, a state encyclopedia, and Vietnamese Wikipedia, a project of the Wikimedia Foundation.
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