#Fact 5 (Drinking water)

1)Bottledng water has been marketed as being cleaner and more pure than ordinary tap water, but, in a recent study, a third of bottled water showed significant chemical or bacterial contamination, including arsenic, nitrates, carcinogenic compounds, and coliform bacteria.

2) Bottled water is rarely tested for purity. An Environmental Working Group study found that ten popular brands were riddled with chemical pollutants and bacteria, some as high as tap water.

3) While the results of tap water contamination tests are made public, manufacturers of bottled water do not divulge their test results. Chalk it up to the protection of trade secrets. Every brand of bottled water has its own proprietary blend of pathogens, contaminants, and waste that give the product its uniquely refreshing taste

4) According to government and industry estimates, almost 40 percent of bottled water is ordinary tap water, often with no additional treatment.

5)Almost 99 percent of imported food is never inspected by the FDA or USDA, the two agencies responsible for protecting Americans from tainted products. They’re busy testing bottled water.

Comments

How Energy conversion from coal is done?

Single generator sets of over 600 MW are now used in the UK, though there are many smaller generators in use. A 600 MW generator can supplythe average needs of over 1 million UK households. Three or four such generators are typically installed in a single large coal-fired station which isoften sited close to a coal mine, away from the city dwellers who consume the electricity. Such generators are usually driven by a compound arrangement of highpressure, intermediate-pressure and low-pressure turbines, increasing in size as the pressure decreases. Modern turbines rotate in a speed range from 1500 to 3500 r.p.m., usually 3000 r.p.m. for the UK’s 50 Hz system. For large coal-fired plant the steam pressure could be 25 megapascals (MPa) with steam temperatures of 500–600 °C to improve the thermodynamic efficiency. In nuclear reactors, which operate under less demanding conditions, the steam is superheated to about 5 MPa and 300 °C. Modern water tube boilers are complex and have ...

How Bulletproof glass works?

Shattering the science behind what makes the breakable unbreakable Bullet-resistant glass works by absorbing a bullet’s kinetic (movement) energy and dissipating it across a larger area. Multiple layers of toughened glass are reinforced with alternated layers of polycarbonate – a tough but ﬂ exible transparent plastic which retains the see-through properties of glass. As a bullet strikes the ﬁ rst glass layer, the polycarbonate layer behind it forces the glass to shatter internally rather than outwards. This process absorbs some of the bullet’s kinetic energy. The high velocity impact also ﬂ attens the bullet’s head. Imagine trying to pierce through a sheet of cotton with the top end of a pencil. It would be very difﬁ cult compared to using the sharp pointed end. The same principle applies here. The ﬂ at-headed bullet struggles to penetrate the layer of polycarbonate. As the bullet travels through each layer of glass and polycarbonate, the process is repeated until it no l...

20 Interesting science fact (PART 2)

1/ Astronauts cannot belch - there is no gravity to separate liquid from gas in their stomachs. 2/ The air at the summit of Mount Everest, 29,029 feet is only a third as thick as the air at sea level. 3/ One million, million, million, million, millionth of a second after the Big Bang the Universe was the size of a ...pea. 4/ DNA was first discovered in 1869 by Swiss Friedrich Mieschler. 5/ The molecular structure of DNA was first determined by Watson and Crick in 1953. 6/ The first synthetic human chromosome was constructed by US scientists in 1997. 7/ The thermometer was invented in 1607 by Galileo. 8/ Englishman Roger Bacon invented the magnifying glass in 1250. 9/ Alfred Nobel invented dynamite in 1866. 10/ Wilhelm Rontgen won the first Nobel Prize for physics for discovering X-rays in 1895. 11/ The tallest tree ever was an Australian eucalyptus - In 1872 it was measured at 435 feet tall. 12/ Christian Barnard performed the first heart transplant i...

Knowledge N Fact4u

Search This Blog