- July 4 -

Sidewalk Egg Frying Day

The origins for this special day can be attributed to the old saying, 'It's so hot you could fry an egg on the sidewalk,' which dates to at least 1899.  Sometimes, on hot summer days, the rays of the sun beat down with such force that it seems hard to breathe.  Everything you touch is hot,...

Sidewalk Egg Frying Day

The origins for this special day can be attributed to the old saying, 'It's so hot you could fry an egg on the sidewalk,' which dates to at least 1899.
Sometimes, on hot summer days, the rays of the sun beat down with such force that it seems hard to breathe. Everything you touch is hot, sizzling hot, 'hot enough to fry an egg on the sidewalk'.

Children and adults have put this idea to the test for decades. Some people are so fascinated by the idea that they have annual contests. For example, the city of Oatman, Arizona, has a Solar Egg Frying Contest every 4th of July. Competition allows essential kitchen aids like reflectors, magnifying glasses and mirrors to maximize the heat.
Unfortunately, very few people have successfully cooked an egg on a sidewalk without some extra help. According to the American Egg Board, eggs need to be heated to a temperature between 62° C (144° F) and 70° C (158° F) to be cooked. That’s why sidewalks don’t make such great frying pans. Although sidewalks get plenty hot during a heat wave, they don’t usually get above 60° C (140° F). They also conduct heat poorly. That means they soak up the heat, but they don’t distribute it efficiently to other things, such as eggs.
If you do manage to cook an egg on the sidewalk, don’t eat it!

Sidewalk Egg Frying Day is great fun for the kids and presents an excellent opportunity to teach them about the benefits and usefulness of solar energy.
Source:
http://wonderopolis.org/wonder/can-you-really-cook-an-egg-on-the-sidewalk/#sthash.qBsxnLu1.dpuf
http://news.yahoo.com/july-4-national-hillbilly-day-sidewalk-egg-frying-171500935.html

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More holidays on this day:

Independence Day in U.S.
Earth at Aphelion

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