*** 20th Anniversary: 2003 to 2023 ***
(Allen Nebraska USA)
Heat, Plastic and Ice
All you have to do is get a black piece of trash bag or any other black wrap and then you have to get clear wrap.
Then get three jars and fill them with 4 pieces of ice. On one jar put the black wrap, on another jar put the clear wrap and on the third jar leave it uncovered.
Put a heat lamp over it. On the first day do it for 5 minutes on the second day do it for 10 minutes and on the third day do it for 15 minutes to record which color makes the ice melt faster. Make sure each jar has a chance to be closest to the heat lamp.
Go Allen Eagles Science! If you have any questions email me at firstname.lastname@example.org thank you :)
Barry's Response - Anybody care to guess what the results of this one would be?
All else being equal one would expect the principle of albedo to dictate the winner.
We call the ability of a surface to reflect light energy its albedo. We calculate albedo by dividing reflected radiation by the incident (incoming) radiation. A value of zero indicates a totally dark surface where all energy is absorbed, while a '1' indicates total reflection, during which the temperature would not increase under any light intensity. Albedo also determines how well the object radiates energy.
Furthermore, albedo is a function of the wavelength. So, while the object in question may completely absorb one set of wavelengths, it may reflect another. This is how all objects have a visible colour. It's also how something can reflect all visible light and absorb infrared or some other band.
In climatology, albedo takes a role in almost all assessments. For instance snow cover reflects nearly all incoming sunlight but radiates infrared quite well, thus keeping the locale colder than it would be if no snow were present.
Thank you for this inspiration, Alexis.
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