Ethylene is a gas used for the artificial ripening of green fruit.

Barometer was invented by Toerricelli in 1643, to measure atmospheric pressure

Audiometr is to measure the intensity of sound.

Altimeter is used for measuring altitude in aeroplnes.

Stereo chemistry studies the arrangement of atoms in molecules and the proprieties that follow from such arrangements.

Radiation chemistry concerns the chemical effects of high energy radiation on substances.

Physical chemistry interprets chemical process in terms of physical properties of matter such as mass, motion, heat, electricity and radiation.

Radio chemistry involves the identification and production of radioactive elements and their use in the study of chemical processes.

Synthetic chemistry involves combining chemical elements and compounds to duplicate naturally occurring substances or to produce compounds that do not occur naturally.

Synthetic chemistry involves combining chemical elements and compounds to duplicate naturally occurring substances or to produce compounds that do not occur naturally.

Polymer chemistry deals with chain like molecules formed by linking smaller molecules and with plastics which consist of chainlink molecules often combined with other materials

Inorganic chemistry deals with the study of compounds other than carbon compounds.

1.       Organic chemistry is the branch of chemistry which deals with the study of carbon compounds.

Histochemistry is a science that provides information about the distribution and activities of chemical components in tissues.

1.       Biochemistry is the study of the substances and chemical process which occur in living organisms.