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Color and Heat absorption
Transcript of Color and Heat absorption
Leonardo Garza Walle
Patricio Gomez Elizondo
Sabrina Larson Villarreal
Jimena Lopez Godínez
Cecilia Rodriguez Cantu
Color and Heat Absorption
The purpose of this project is to investigate which is the amount of thermal energy and heat absorption in specific colors, so we can know which colors are better to use according to the situation. The electromagnetic spectrum is the term used by scientists to describe the range of light that exists. From radio waves to gamma rays, most of the light in the universe is, in fact, invisible to us!
What is the amount of heat that each color absorbs?
We consider that the darker colors will absorb more heat.
COLORED CUPS OR CONTAINERS
Different color cellophane
100 Watt lightbulb with its lamp.
Thermometer(s) that can
measure temperatures lower
than 20° celsius.
Water (as much as needed)
The difference between the temperatures was not very significant but in our body 2 or 3 °Celsius can make a big difference.
In this project we did it in a small scale compared to what this is used in real life.
Applications in real Life
This is used in real life for big projects, like
Painting houses, buildings or any type of construction.
1: Cut a square of cellophane of each color and place them in the top of the same color cup.
2: Make a whole in the middle of the cellophane.
3: Paste the cellophane on the top of the cup with tape.
4: Pour 250 ml. of water to each cup, through the hole.
5: Measure the Initial temperature of the water (with a thermometer that can measure temperatures below 20 C°
6: Once you finish all the steps below, place a lamp in top of a box not a very high box a small box (higher than the cups).
7: Place the lamp in a way that the light hits directly into the cup(s). Turn on the lamp, and leave it there for 30 min.
8: After the time passed check the temperature of the cup(s) and write down the initial and final temperature.
9: Repeat the steps from 6-9 until you finish with all the cups and write everything that happened and the changes of the temperatures.
10: If you want, see if it’s the same with different materials do the same as the steps above.
Our hypothesis was correct, the darkest color, indigo, was the one that absorbed more light, in both, plastic and glass. We did not think the green container would absorb that much light, but it ended up being one of the colors that absorbed light the most.
With the Plastic containers these where the 2 containers that got the highest temperatures:
Dark Purple (indigo) 28 C°
Green 27 C°
With the glass cups these where 2 cups that
that got the highest temperatures:
Dark Purple (indigo) 27 C°
Blue 25 C°
As you notice The Indigo containers where the ones that got the highest temperatures, that proves our hyphotesis.
A flat (horizontal) surface receives about 1000 watts of sunlight per square meter. (This is about 100 watts, or the power of a bright incandescent light bulb, per square foot.) Traditional dark roofs strongly absorb this sunlight, heating both the building and the surrounding air. This increases energy use in air conditioned buildings, and makes non-air conditioned buildings less comfortable. Hot dark roofs also aggravate urban heat islands by warming the air flowing over the roof, and contribute to global warming by radiating heat into the atmosphere.
Substituting a cool roof for a warm roof reduces conduction of heat into the building, convection of heat into the outside air, and thermal radiation of heat into the atmosphere.
This benefits our buildings, our cities, and our planet.
Hot pavements aggravate urban heat islands by warming the local air, and contribute to global warming by radiating heat into the atmosphere
Cool pavements cool the city air, reducing heat-related illnesses, slowing the formation of smog, and making it more comfortable to be outside
A light-colored or cool-colored car shell reflects more sunlight than a traditional dark car shell. This cools the cabin air and reduces the need for air conditioning.
Fuel savings. Substituting a cool shell for a conventional black shell permits the use of a smaller air conditioner, improving fuel economy by 1% (for a cool colored shell with 35% solar reflectance) to 2% (for a white or silver shell with 60% solar reflectance).
Color Wavelength and Reflection
Our eyes are sensitive to light which lies in a very small region of the electromagnetic spectrum labeled as visible light. this “visible light” corresponds to a wavelength in a range of 400 nm (nanometers) to 700 nm (nanometers). the visible light in this range goes from violet to red.
The human eye is also not capable of seeing some light such as radiation and wavelengths outside of the visible spectrum.
The visible colors from shortest to longest wavelength are: violet, blue, green, yellow, orange, and red.
Ultraviolet radiation has a shorter wavelength than the visible violet light. Infrared radiation has a longer wavelength than visible red light. The white light is a mixture of the colors of the visible spectrum. Black is a total absence of light.
What is electromagnetic spectrum?
The electromagnetic spectrum is the term used by scientists to describe the entire range of light that exists. From radio waves to gamma rays, most of the light in the universe is, in fact, invisible to us!
The visible violet light has a wavelength of about 400 nm. Within the visible wavelength spectrum, violet and blue wavelengths are scattered more efficiently than other wavelengths. The sky looks blue, not violet, because our eyes are more sensitive to blue light (the sun also emits more energy as blue light than as violet).
The visible indigo light has a wavelength of about 445 nm.
The visible blue light has a wavelength of about 475 nm. Because the blue wavelengths are shorter in the visible spectrum, they are scattered more efficiently by the molecules in the atmosphere. This causes the sky to appear blue.
The visible green light has a wavelength of about 510 nm. Grass, for example, appears green because all of the colors in the visible part of the spectrum are absorbed into the leaves of the grass except green. Green is reflected, therefore grass appears green.
The visible yellow light has a wavelength of about 570 nm. Low-pressure sodium lamps, like those used in some parking lots, emit a yellow (wavelength 589 nm) light.
The visible orange light has a wavelength of about 590 nm.
The visible red light has a wavelength of about 650 nm. At sunrise and sunset, red or orange colors are present because the wavelengths associated with these colors are less efficiently scattered by the atmosphere than the shorter wavelength colors (e.g., blue and purple). A large amount of blue and violet light has been removed as a result of scattering and the longwave colors, such as red and orange, are more readily seen.
Is this important for birds and animals?
Yes it is important since the different color of animals it depends on how much heat it absorbs, because some colors absorb more heat than others this is proved on our experiment that it depends on the color.