# Joseph-Louis Lagrange

### By Sophia R, 7th period

## Biography

Lagrange was born in Italy in 1736 and died 77 years later in 1813 in Paris, France. He studied at the College of Turin, the Italian city he was born in, during his mid-teens. Back then they didn't have degrees, but his main studies were Latin and language. However we wasn't interested into math or physics until he was out of college, at 17.

## Contributions to Physics

His main contributions to physics was on mathematical side of it. He developed the

**metric system**as well as the decimal base. His system is used in every country of the world, besides the United States, as it's very easy to use in everyday life and simple to convert. The decimal base it what makes the metric system easy to convert. He also developed the basis of**mechanics;**the equations of**motion, laws of conservation**, the**law of equilibrium**, and the equations of**vibrations**, along with the properties of strings and pulleys. This is also known as Langrangian mechanics, as he was the first person to expand and develop Newton's ideas into equations and formulas. Many consider Lagrange the father of fluid and solid mechanics, due to his deep analysis of physics principles. He also formulated the differential equations of transverse vibrations of strings, as well as the vibrations of sound.