In a thermogram film sensitive to infrared Radiation reverals the location of regisions of sigficent thermal energy transport. The white areas are the regisions of greatest heat loss to cold ambient air A hand-held night vision a view at night using this deviceA hand-held night vision, a view at night using this device In a thermogram, film sensitive to infrared Radiation reverals the location of regisions of sigficent thermal energy transport. The white areas are the regisions of greatest heat loss to cold ambient air