In the context of cooking with infra-red radiation, it
seems sensible to adopt the range de®nitions of wavelengths
quoted by Sakai & Hanzawa (1994) with mid
infra-red radiation between a wavelength of 1.4±3.0 lm
and far infra-red radiation at a wavelength greater than
3.0 lm. The selection of 3.0 lm as the boundary value is
relevant to cooking eects.