- conical quartering
- 锥形四分法
English-Chinese chemistry dictionary (英汉化学大词典). 2013.
English-Chinese chemistry dictionary (英汉化学大词典). 2013.
Coning and quartering — is a method used by analytical chemists to reduce the sample size of a powder without creating a systematic bias. The technique involves pouring the sample so that it takes on a conical shape, and then flattening it out into a cake. The cake is… … Wikipedia
Sub-sampling — In analytical chemistry, sub sampling is a procedure by which a small, representative sample is taken from a larger sample. Good sub sampling technique becomes important when the large sample is not homogeneous.TechniquesConing and… … Wikipedia
Melting point apparatus — A Fisher Johns apparatus A melting point apparatus is a scientific instrument used to determine the melting point of a substance. Some types of melting point apparatuses include the Thiele tube, Fisher Johns apparatus, Gallenkamp (Electronic)… … Wikipedia