i have a science project in which i need to make something that will make water in a 40ml beaker heat up by 40 degrees using only sunlight in one hour. i should probably use mirrors and lenses.. but if you know of any good sites could you refer them to me? thank you!
2007-05-26 12:05:06 · 7 answers · asked by nickicharae 2 in Science & Mathematics ➔ Other - Science
You will need mirrors to reflect all the sunlight that you can.
You need to focus this light also, a lens can be used or curved mirror.
Put the water into a black container since black absorbs the heat .
Concave sides lined with aluminum foil will focus the light to the middle.
2007-05-26 13:40:57 · answer #1 · answered by science teacher 7 · 0⤊ 0⤋
The power of sunlight is about 1 kilowatt per sq. m. The specific heat of water is 1 degree centigrade per joule per cc, I think. I forget what 1 ml is in terms of cc, but I suspect it is 1 cc. Suppose it is for this calculation. The time is 3600 sec. Therefore you would need 40 degrees X 40 ml /3600 seconds = 4/9 watts. To get this you need to collect 4/9 / 1000 sq m. A magnifying glass with an aperture of about 1 inch would be OK. As someone else suggested, paint the bottom of the beaker black or put a black pad inside to absorb the light.
I hope my units are right, but you get the idea of how to make the calculation.
2007-05-26 19:36:05 · answer #2 · answered by JeffT 3 · 0⤊ 0⤋
I had this same sort of project in Junior High. I would use a system of mirrors to reflect a large amount of sunlight onto the beaker. I would also place lenses around the beaker to magnify all sunlight approaching the beaker.
Good luck!
2007-05-26 19:08:22 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Stick a black metal object in the bottom of the beaker and point lots of magnifying glasses at it
2007-05-26 19:08:36 · answer #4 · answered by Anonymous · 0⤊ 0⤋
One thought: Start with the water as cold as possible. So that before the start of the experiment you would have ice floating in the water. Take the ice out and immediately take your starting temperature.
2007-05-26 19:15:07 · answer #5 · answered by jsardi56 7 · 0⤊ 0⤋
Here is a website that has many different designs/plans for solar ovens with nice pictures and links. Since you can cook with these, they can generate a lot of heat.
2007-05-30 15:19:44 · answer #6 · answered by olyforumguy 2 · 0⤊ 0⤋
connect a 30 ft black hose to it, and lay it into the sun.
2007-05-26 19:09:20 · answer #7 · answered by Anonymous · 0⤊ 0⤋