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scientific facts

Scientific facts

Music was sent down a telephone line
for the first time in 1876, the year the
phone was invented.
Sound travels through water 3 times
faster than through air.
A square piece of dry paper cannot be
folded in half more than 7 times.
Air becomes liquid at about minus 190
degrees Celsius.
Liquid air looks like water with a bluish
A scientific satellite needs only 250
watts of power, the equivalent used by
two hour light bulbs, to operate.
The thin line of cloud that forms
behind an aircraft at high altitudes is
called a contrail.
Radio waves travel so much faster
than sound waves that a broadcast
voice can be heard sooner 18,000 km
away than in the back of the room in
which it originated.
A US ton is equivalent to 900 kg (2000
pounds). A British ton is 1008 kg (2240
pounds), called a gross ton.
Industrial hemp contains less than 1%
of THC, the psychoactive component of
Since space is essentially empty it
cannot carry sound. Therefor there is
no sound in space, at least not the sort
of sound that we are used to.
The Space Shuttle always rolls over
after launch to alleviate structural
loading, allowing the shuttle to carry
more mass into orbit.
The word “biology” was coined in 1805
by Jean-Baptiste Lamarck.
Most of the air is about 78% nitrogen
gas. Only 21% consists of oxygen. The
remaining 1% consists of carbon
dioxide, argon, neon, helium, krypton,
hydrogen, xenon and ozone.
Argon is used to fill the space in most
light bulbs. Neon is used in fluorescent
signs. Fluorescent lights are filled with
mercury gas.
Hydrogen gas is the least dense
substance in the world.
Water expands by about 9% as it
The surface of hot water freezes
faster than cold water but the rest of
the water will remain liquid longer
than in a cold sample.
The smallest transistor is 50-
nanometres wide – roughly 1/2000 the
width of a human hair.
A compass does not point to the
geographical North or South Pole, but

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