Question

what is meant by metrology .what is the role of roasting and calcination in the metolrgy​

Answer 1

Answer:

The science of weights and measures; the study of units of measurement. a particular system of units.

Roasting : It is the process of converting an ores to oxide by strongly heating it in the presence of excess of air . ... Calcination : It is the process of converting an ores to oxide by strongly heating it in limited air . For example carbonate ores are converted into the oxide by heating in the absence of air.