Question

Considering how to use the instrument as little as possible under the premise of safety experiments to measure the density of chlorine gas at normal temperature and pressure. Design a specific experimental scheme and give the corresponding calculation formula.

Answer 1

The lower flammable limit (LFL) is the lowest concentration of a
flammable material in air that can be ignited. The upper flammable limit (UFL) is
the highest concentration that can be ignited. Any concentration between the LFL
and the UFL can be ignited if an ignition source is present. Both LFL and UFL
are usually measured for concentrations of flammable chemicals in air. The LFL
and UFL values depend on the temperature of the system, and to a lesser extent,
the pressure. Flammability limits are usually measured at ambient conditions,
about 25 /C and atmospheric pressure. The flash point temperature of a liquid is
the lowest temperature at which the liquid surface can be ignited. The flash point
is normally measured at atmospheric pressure..

There are many instances in chemical processes when multi
component liquid mixtures are processed at temperatures above their atmospheric
pressure bubble point. The pressure under which processing takes place must
then be kept above the bubble point pressure of the mixture in order to prevent the
mixture from vaporizing. If process pressures become too high, the liquid
mixture will be vented through a relief valve to a lower pressure, usually
atmospheric pressure. When the pressure is reduced, part of the liquid will flash
to vapor and part will remain as a liquid. Proper design of relief systems requires
that the vapor and liquid thus formed be disposed of without being discharged to
the air or water at the plant.