Saha Meghnad

Saha, Meghnad (1894-1956) Indian nuclear physicist and astrophysicist who derived the formula (saha'sequa-tion) linking the degree of ionization in a gas to temperature and electron pressure that is vital to the interpretation of stellar spectra. He confirmed his theory of thermal ionization (1920) by studying the solar chromosphere and spectra of stars, especially novae.