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Science, education, medicine / Units of measurement, measures, calendars / Units of measurement
(2)
OM - electrical resistance
(3)
BAR - pressure
BEL - sound intensity
BAUD - telegraph transmission speed
BER - radiation dose
GAL - acceleration
NIT - brightness
ERG - work, energy and amount of heat
(4)
BARN - effective cross section of the processes of collision of atomic or nuclear particles
WATT - power
HERZ - batch process frequency
GRAY - absorbed radiation dose
DINA - strength
CURI - radioactivity
LUX - illumination
MOL - amount of substance
POIS - dynamic viscosity
STAN - strength
TEX - linear density
TORR - atmospheric pressure
KNOT - speed of sea vessels
CENT - frequency interval
(5)
AMP - electric current strength
WEBER - magnetic flux
VOLT - electrical voltage
GAUSS - magnetic induction
HENRY - inductance
TEN - writing paper count
KARAT - a measure of the gold content in alloys
PENDANT - quantity of electricity
LUME - luminous flux
PIEZA - pressure and mechanical stress
SAVAR - frequency interval in musical acoustics
CANDLE - power of light
STOX - kinematic viscosity
TESLA - magnetic induction
FARAD - electric capacitance
(6)
DEGREE - temperature, angles
JOUL - energy, work, amount of heat
DIRHEM - a measure of the mass of coins in the ARE and Sudan
SIVERT - equivalent dose of radiation
KILOOM - electrical resistance (a multiple of an ohm)
MEGAOM - electrical resistance (multiple of ohm)
MINUTE - 1) flat angle, 2) time
NEWTON - strength
OCTAVA - frequency interval
RADIAN - flat angle
SIEMENS - electrical conductivity
STILB - brightness
FARAD - electric capacitance
OERSTED - magnetic field strength
(7)
ALBEDO - surface reflectivity
DECIBELS - sound intensity (multiple of Bel)
CALORIE - the amount of heat, energy
CANDELA - light intensity (brightness)
KELVIN - thermodynamic temperature
MILLIOM - resistance
PASCAL - pressure, mechanical stress
X-ray - dose of X-ray and gamma radiation
SEC - 1) flat angle, 2) time
(8)
Gigahertz - frequency of a periodic process
Gilbert - magnetomotive force
DIOPTER - optical power of the lens
KILOWATT - power (a multiple of a watt)
KILOHERTZ - frequency of a periodic process (a multiple of hertz)
MAGNETON - magnetic moment
MAXWELL - magnetic flux
MEGAWATT - power (a multiple of a watt)
MEGAHERTZ - frequency of a periodic process (a multiple of a hertz)
MILLIBAR - pressure (multiple of bar)
PROMILLE - a thousandth of a number, a tenth of a percent, denoted by ‰
SVERDRUP - water flow in the ocean current
TERAWATT - power
(9)
APOSTILB - brightness of the illuminated surface
ATMOSPHERE - pressure
BECQUEREL - activity of a nuclide in a radioactive source
KILOTON - power of a nuclear charge
MEGATONN - the power of a nuclear charge
STERADIAN - solid angle
(10)
KILOJOULE - energy, work, amount of heat (multiple of joule)
KILONEWTON - force (a multiple of the joule)
MEGAJOULE - energy, work
MILLIAMPER - strength of electric current
PICOFARADA - electric capacitance
(11)
KILOCALORIUM - the amount of heat (a multiple of a calorie)
KILOPASCAL - pressure (multiple of Pascal)
MILLINEWTON - force (multiple of newton)
(12)
MICROSECOND - time of chemical processes
MILLIPASCAL - pressure (multiple of Pascal)
(13)
ELECTRONVOLT - energy
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Random news from the Archive Dry ice engine
16.03.2015
Researchers have figured out how to power the first colonizers of Mars: the planet has a lot of dry ice that can be used to generate available energy.
You have probably noticed how a drop of water, hitting a hot frying pan, begins to roll on the surface. It would seem that the temperature of the pan is much higher than the boiling point of water, and the drop should immediately evaporate, but it still "lives" for some time. This effect was first described by Johann Leidenfrost in 1756. Why doesn't the drop evaporate instantly? It's all about the steam layer, which is formed at the point of contact between the drop and the hot surface. Part of the drop turns into steam, which lifts the drop above the surface, preventing the remaining liquid from evaporating instantly. As a result, the drop runs around the pan for quite a long time.
The Leidenfrost effect isn't limited to frying pans. For example, if you very quickly dip your finger into a glass of liquid nitrogen and quickly pull it back out, then, oddly enough, the finger will not freeze and fall off, although the temperature of liquid nitrogen is -196 ° C. This is due to the fact that liquid nitrogen begins to boil upon contact with warm skin, on which a protective layer of already gaseous nitrogen forms. And gases cool and heat up much more slowly than liquids, so the finger of a reckless experimenter does not have time to freeze. True, there is still a risk of getting burned, so in no case do not test the Leidenfrost effect on yourself. An even more extreme and much more dangerous trick is to lower a wet hand into a container with liquid metal - the water on the surface of the hand instantly boils and for a fraction of a second forms a protective layer between the skin and the molten metal.
Tricks tricks, but how to get real benefit from this phenomenon? Researchers at Northumbria University in the UK have made a prototype engine that can run on a piece of dry ice. The design is based on the same Leidenfrost effect. We remember that a drop of liquid runs over a hot surface. A piece of dry ice behaves exactly the same way if it is thrown into water. Dry ice is unique in that when it is heated from a solid phase it immediately turns into a gas, bypassing the liquid phase. The whole question is how to direct his energy in a useful direction. Engineers have long developed technology to convert steam energy into mechanical energy: in a gas turbine engine, a jet of steam or gas hits the surface of the turbine blades, which starts to rotate. But in our case, the researchers went the other way.
They made the heated surface in the shape of a disk, with a profile similar to the blades of a turbine. Now, if a drop of water is placed on such a heated surface, then the steam formed at the point of contact will not only support the drop in weight, but will also push it in a certain direction. The drop will run around in a circle until it evaporates. But what happens if a disk of dry ice is placed on such a heated surface? Evaporating carbon dioxide will begin to spin the disk, moreover, the surface geometry will not allow it to move off the axis, gas flows will return the disk to the center. Now, if you fix magnets on a disk of dry ice, and place the entire structure inside a conductive circuit, you will get a real electric generator, in which there are no rubbing parts, and hence friction losses. The authors of the invention posted on the site a video of how it all works.
Okay, the prototype engine works, but where do you get fuel for it? Dry ice does not occur naturally. This is where the researchers swung, no less, for generators for future colonizers of Mars or other planets. Many futurologists are sure that sooner or later humanity will have no choice but to populate the planets closest to us.
Now programs are being seriously discussed and developed to send an expedition to the red planet. The members of the expedition will have to equip their lives there, and one of the main problems will be finding sources of energy. The fact is that on Mars, carbon dioxide is often found in solid form, that is, in the form of dry ice. And it can be used as an energy resource. The uniqueness of the invented engine is in the simplicity of design - there are practically no replaceable parts in it. And when the nearest store is more than 50 million kilometers away, the issue of equipment reliability is one of the first places.
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