Showing posts with label facts. Show all posts
Showing posts with label facts. Show all posts
Wednesday, March 18, 2015
Mercury chemical element facts about mercury element
Mercury chemical element - facts about mercury element
Some mercury compounds are still used in antiseptics and eye ointments.
What is the chemical symbol for the element mercury?
The chemical symbol for the element mercury is:Hg
Atomic Number: 80
Atomic Mass: 200.59 amu
Number of Protons/Electrons: 80
Number of Neutrons: 121
Who discovered the element mercury?
The element mercury was known since ancient times and it is unknown who discovered it first.Its name originates from the planet Mercury
Is mercury poisonous?
Small amounts of liquid mercury, such as that found in a thermometer, are not especially dangerous, because the element if ingested is poorly absorbed by the gastrointestinal tract.However, mercury compounds, known as mercury salts, and mercury vapor are toxic, particularly the vapor, which is very readily absorbed through the lungs.
It affects the brain very quickly and is retained in the kidneys, resulting in renal failure.
How do you get mercury poisoning?
Acute mercury poisoning may result from accidental (or deliberate, in the case of suicide attempts)ingestion of mercury salts.
Chronic mercury poisoning usually results from exposure to mercury in the workplace or ingestion of mercury from foods contaminated by industrial pollution or chemical treatment.
A pollution-related outbreak occurred in Minamata Bay, Japan where several hundred people suffered irreversible damage or death from eating contaminated fish.
Mercury poisoning symptoms
Acute mercury poisoning symptoms include:- diarrhea,
- vomiting and
- kidney failure.
- tremors albuminaria,
- paralysis, and
- mental disturbances.
Monday, March 9, 2015
5 Interesting Facts About Pencils Did You Know
This post is the first of a series called “Did You Know?”. Lists in these series will be trivia-based, containing fun/amazing/interesting facts about things we use in our everyday life. This post is about pencils.
A pencil, as we all know, is a simple instrument used for writing and drawing. It’s an ordinary item we use everyday; and something an office is incomplete without. Here are five interesting facts about pencils (in some detail):
One. History
The “lead” of the pencils, is actually graphite, as you may already know. This graphite was discovered in a large and very pure quantity near Cumbria, England, sometime in the early-mid 1500s. It was discovered to be very useful for marking sheep. So, the first ever “pencil” was that used for marking sheep.
Also, graphite blocks could be easily cut into sticks. These sticks were then wrapped in sheepskin or string, for stability. So, the first “pencils” weren’t wrapped in wood cases, as we know them now. These wood cases were first thought of by the Italians, several years later. But the actual wooden pencils were produced in the mid seventeenth century, in Germany. The graphite was enclosed between two pieces of wood.
The average pencil (about 18 centimetres long) can draw a line 35 miles long, or write about 45,000 words. Talk about being economical!
By the way, if you’re feeling eager to set a world record, why not try this out? Nobody has, yet
More than 2 billion pencils are used in the United States every year. The global number? More than 14 billion, enough to easily circle the globe about 60 times. Also, more than a million pencils are used annually on the floor of the New York Stock Exchange. That’s a lot.
An average sized tree can make about 170,000 pencils. So, it’s safe to assume that if there are 14 billion (14 000 000 000) pencils made each year world wide then, and one tree can produce about 170,000 pencils, there are approximately 82 000 trees cut each year, to meet the annual demand of about 14 billion pencils. That’s a LOT of trees!
Could you ever imagine that something so ordinary could have such a big impact on the environment?
Three. People
Pencils are often associated with great names in the literary world. Henry David Thoreau used pencils to write Walden. John Steinbeck, an American writer used over 300 pencils to write his novel East of Eden. He was one obsessed pencil user!
Four. The Story Of The Eraser
Most pencils, as we know them today, are capped with an eraser at the top. But until about 160 years ago, pencils did not have erasers attached to their tops. One popular theory about the reason for this is that teachers felt that erasers would encourage students to make mistakes. After all, if you’ve made a mistake, you can easily rub it out
Also, most European pencils do not have erasers attached to their tops, while American ones do. Perhaps this is just a matter of preference, but, are Europeans more confident scribblers than Americans
Five. Uses
Pencils are supposed to be used primarily for writing/scribbling or drawing. But, what’s the fun if you cannot find a clever use of something ordinary?
A pencil eraser is soft. It is perfect for sticking and storing things like pins: you just stick the pins into the eraser, and they’ll stay there. Or, you could use a couple of pencils as chopsticks; for pencils are thin and have good control. Use two pencils as tweezers to pick up fallen stuff, or to eat your noodles!
Have an ambitious little plant aiming for the skies? Why not support it’s delicate stem by sticking a pencil into the flower pot, and tying the stem to it with a piece of string? Pencils are ideal for this job!
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