What is the molar absorption coefficient in Beer-Lambert’s Law?

The molar absorption coefficient (ε) in the Beer-Lambert Law is a constant that represents the ability of a substance to absorb light at a specific wavelength. It is also known as the molar absorptivity or molar absorption index. It depends on both the chemical properties of the substance and the wavelength of light used. The molar absorption coefficient is expressed in units of L·mol⁻¹·cm⁻¹ and is crucial for calculating absorbance in the Beer-Lambert equation.