Alexis Thérèse Petit (October 2, 1791 - June 21, 1820) was a French physicist. October 2nd is the 275th day (276th in leap years) of the year in the Gregorian Calendar, with 90 days remaining. ... 1791 was a common year starting on Saturday (see link for calendar). ... June 21 is the 172nd day of the year (173rd in leap years) in the Gregorian Calendar, with 193 days remaining. ... 1820 was a leap year starting on Saturday (see link for calendar). ... The word physicist should not be confused with physician, which means medical doctor. ...

Petit was born in Vesoul, France. He is best known for the Dulong-Petit law for the specific heat capacity of metals, which he co-discovered with Pierre Louis Dulong in 1819. Vesoul is a French city and commune located in the Haute-Saône département. ... The Dulong-Petit law, found in 1819 by Pierre Louis Dulong and Alexis Thérèse Petit, states the classical expression for the specific heat capacity of a crystal due to its lattice vibrations. ... The specific heat capacity (symbol c or s, also called specific heat) of a substance is defined as heat capacity per unit mass. ... In chemistry, a metal (Greek: Metallon) is an element that readily forms ions (cations) and has metallic bonds, and it is sometimes said that it is similar to a cation in a cloud of electrons. ... Pierre Louis Dulong (February 12, 1785 - July 19, 1838) was a French physicist and chemist. ... 1819 was a common year starting on Friday (see link for calendar). ...

Petit died in Paris, France. The Eiffel Tower has become a symbol of Paris throughout the world. ...