In the dry valleys region of Antarctica, it has not rained in 2 million years according to scientists
The Eisenhower interstate system requires that one mile in every fivemust be straight. These straight sections are usable as airstrips intimes ofwar or other emergencies.
Marilyn Monroe had six toes on one foot
It is believed that Shakespeare was 46 around the time that the King James Version of the Bible was written. In Psalms 46, the 46th word from the first word is shake and the 46th word from the last word is spear.
In 1955, only 330 Volkswagen Beetle's were sold at a price of $1800 each in the United States.
Seaweed can grow up to 12 inches per day.
James Madison, 5 feet, 4 inches tall, was the shortest president of the US. Abraham Lincoln was the tallest at six feet, 4 inches.
Dominique Larrey, Napoleon's chief surgeon, could amputate a leg in 13 seconds.
The average number of peanuts in a box of Cracker Jacks is 27.
Real diamonds can be made from peanut butter.
Australia has had stamps that actually look like gems. In 1995 and 1996 they used a special technology to make the stamps look like diamonds and opals.
Hannibal, who was a soldier, had only one eye after getting a disease while attacking Rome
6263. Animal Facts
The job of guard termites is to defend the termite nest or mound. Sometimes they explode in their efforts to deter attackers.
The loss of eyelashes is referred to as madarosis
Marseilles is the oldest city in France. It was settled in about 6,000 B.C. by Ionian Greeks, who called it Massilia.
Researchers have developed odourless socks. The sock fabric is made by attaching molecules that contain chlorine called halamines to textile fibers
Cheese is the oldest of all man-made foods.
A human's scent membrane in the nose is about the size of a postage stamp. A dog's is about the size of a handkerchief.
Trees that are near street lights do not shed their leaves as fast as a tree that is in the country
The largest group viewing online pornography is ages 12 to 17.
Hippopotamuses actually sweat blood. Their skin contains a great amount of an oily substance that exudes from the pores, and when the beast perspires a little blood gets mixed in.
One million Americans, about 3,000 each day, take up smoking each year. Most of them are children.
During World War II, Kit Kat was unavailable due to milk shortages, so the chocolate bar was made without milk
The reason the Animal Crackers box is designed with a string handle is because when the popular circus theme was introduced in 1902 they thought it would also be a good idea to package them with a string as a Christmas novelty so they could be hung from Christmas trees
The Apollo 11 plaque left on the Moon says, Here men from the planet Earth first set foot upon the Moon July 1969, A.D. / WE CAME IN PEACE FOR ALL MANKIND.
The country with the highest consumption of candy at 29.5 pounds annually per person is Denmark
Manhattan Island from end to end is less than one million inches long.
A survey done by Clairol 10 years ago came up with 46% of men stating that it was okay to color their hair. Now 66% of men admit to coloring their hair
Hans Christian Anderson, creater of fairy tales, was word-blind. He never learned to spell correctly, and his publishers always had errors
A teaspoon of neutron star material weighs about 110 million tons.
Stanley Kubrick approached Lloyd's of London about an insurance policy in case extraterrestrial life was discovered before the release of his movie 2001: A Space Odyssey.
The temperature of milk when it is coming out of a cow is about 36 degrees celsius
Betsy Ross is the only real person to ever have been the head on a Pez dispenser.
If you rubbed garlic on the sole of your feet, it would be absorbed and eventually show up on your breath.
In 1998, approximately 1.6 billion tree seedlings were planted in the United States. This amounts to about five trees per American
Most snails are hermaphrodites, meaning they have both female and male reproductive organs
A toothbrush within 6 feet of a toilet can get airborne bacteria from flushing.
Approximately 20% of Americans have a passport
The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
The strongest muscle in the human body is the tongue. (The heart is not a muscle.)
Spiders have claws at the ends of their legs
A porpoise swims slowly in a circle as it sleeps.
Actress Meryl Streep holds the record for the most Oscar nominated actress, with a record of 13 nominations
Actor Arnold Schwarzenegger bought the first Hummer manufactured for civilian use in 1992. The vehicle weighed in at 6,300 lbs and was 7 feet wide.
Banging your head off a wall uses 150 calories an hour!
Beaver teeth are so sharp that Native Americans once used them as knife blades.
Cows drink anywhere from 25-50 gallons of water each day
Best Gurudwaras in India You Must Visit
Best Names at the Sochi Olympics
Favourite Christmas Movies
Cure for Arthritis
Good Luck Charms From Around The World
Rules to play Hot Air Ballooning
Hot air balloon physics analysis
Lets examine the physics of a hot air balloon using a sample calculation.
The heated air inside the envelope is at roughly the same pressure as the outside air. With this in mind we can calculate the density of the heated air at a given temperature, using the Ideal gas law, as follows:
P = ?RT
P is the absolute pressure of the gas, in Pa
? is the density of the gas, in kg/m3
R is the gas constant, in Joules/kg.K
T is the absolute temperature of the gas, in Kelvins (K)
Normal atmospheric pressure is approximately 101,300 Pa
The gas constant for dry air is 287 Joules/kg.K
The air inside the envelope is typically heated to an average temperature of about 100 degrees Celsius, which is 373 K
Substituting the above three values into the Ideal gas law equation and solving for ? we get ? = 0.946 kg/m3. This is the density of the heated air inside the envelope. Compare this to normal (ambient) air density which is approximately 1.2 kg/m3.
Next, for an average size balloon with an envelope volume of 2800 m3 we wish to determine the net upward buoyant force generated by the envelope.
The net buoyant force is defined here as the difference in density between the surrounding air and the heated air, multiplied by the envelope volume. Thus,
FB,net = (1.2 0.946)x2800 = 711 kg (1565 lb)
This is the net buoyant force pushing upwards on the heated air inside the envelope. The hot air balloon components (such as envelope, gondola, burner, fuel tanks, and passengers) can at most weigh 711 kg in order for the buoyant force to be able to completely lift the hot air balloon off the ground.