Frosted Globe

March 11, 2014

Frostglobe1

Photographer: Daniela Rapava
Summary Authors: Daniela Rapava; Jim Foster

March 2014 Viewer's Choice The photo above shows a frosted bubble that's resting on an elevated surface, just above the ground, outside of the observatory in Rimavska Sobota, Slovakia. It’s approximately 1 in (2.5 cm) in diameter and was created from water, detergent and sugar. This bubble became frosted in a little more than 7 minutes. The air temperature at the time was 19 F (-8 C), but the ground temperature was likely several degrees colder. There was sufficient water vapor in the cold air to coat the bubble in frost crystals –- like frost on a window pane. I noticed that this frost painted the bubble from the bottom up. Photo taken on the morning of February 5, 2014.

Photo details: Camera Model: Canon EOS 40D; Lens: EF100mm f/2.8 Macro USM; Focal Length: 100mm; Focus Distance: 0.63m; Aperture: f/13.0; Exposure Time: 0.0016 s (1/640); ISO equiv: 200.