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Standard ambient temperature is 25 ℃ or 298.15 K or 77 ℉.
Standard pressure is 1 bar or 100.000 kPa or 750.06 mmHg (or torr) or 14.504 psi.
Normal temperature is 20 ℃ or 293.15 K or 68 ℉.
Normal pressure is 1 atm or 101.325 kPa or 760 mmHg (or torr) or 14.6959 psi.
Chemistry is a branch of science which deals with the study of matter composed of atoms and molecules, their properties, composition, structure, behaviour, and interactions among constituents of matter. Modern chemistry can be categories into five main branches: Physical chemistry, Analytical chemistry, Inorganic chemistry, Organic chemistry, and Biochemistry.
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