Atreatment for improving the appearance and stability of porous gems is

Answer;

-colorless impregnation

Explanation;

-Colorless impregnation improves the appearance and stability or porous gems like jadeite. Sometimes a dye is added to improve color. Colorless impregnation involves filling of pores or other openings with melted wax, resin, polymer, or plastic to improve appearance, luster and stability. Commonly used in turquoise and jadeite. Dye could be added to the filler. This would be considered two treatments, impregnation and dyeing.

-The impregnation of a porous gemstone with a colorless agent (usually plastic) is meant to give it durability and improve appearance. Example:Stabilized turquoise

population. population is the number of people or animals in a particular place. an example of population is over eight million people living in new york city.

here is your answer hope i .

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.