Refractive index temperature and wavelength dependencies of normal saturated fatty acids in liquid state

Measurements of the refractive index from 293 to 321 K at four fixed wavelengths, from 587.6 to 404.7 nm, are reported for valeric acid (pentanoic acid), caproic acid (hexanoic acid), oenantic acid (heptanoic acid), caprylic acid (octanoic acid), and pelargonic acid (nonanoic acid). We also report the temperature and wavelength dependencies of the refractive index obtained from a least-squares routine. The agreement between the measured and calculated refractive indices lies within the experimental uncertainty.