unit
of measure
conversions
equivalences
|
|
|
|
italiano
 |
english
 |
|
|
|
elctromagnetics
waves
| frequency
|
length
|
energy
( eV ) |
denomination
|
| from
<30 hz to 3 khz |
from
>10 000 km to 100 km |
a
10-11 |
electric
power and telephony |
| from
3 khz to 30 khz |
from
100 km to 10 km |
from
10-11 to 10-10 |
VLF
|
| from
30 khz to 300 khz |
from
10 km to 1 km |
from
10-10 to 10-9 |
LF
|
| from
300 khz to 3Mhz |
from
1 km to 100 m |
from
10-9 to 10-8 |
MF
|
| from
3 Mhz to 30 Mhz |
from
100 m to 10 m |
from
10-8 to 10-7 |
HF
|
| from
30 Mhz to 300 Mhz |
from
10 m to 1 m |
from
10-7 to 10-6 |
VHF
|
| from
300 Mhz to 3 Ghz |
from
1 m to 100 mm |
from
10-6 to 10-5 |
microwaves
UHF |
| from
3 Ghz to 30 Ghz |
from
100 mm to 10 mm |
from
10-5 to 10-4 |
microwaves
SHF |
| from
30 Ghz to 300 Ghz |
from
10 mm to 1 mm |
from
10-4 to 10-3 |
microwaves
EHF |
| from
300 Ghz to 4*1014 hz |
from
1 mm to 750 nm |
from
10-3 to 1.5 |
infrared
|
| from
4*1014 hz to 8.5*1014 hz |
from
750 nm to 350 nm |
from
1.5 to 3.5 |
visible
light |
| from
8.5*1014 hz to 3*1016 hz |
from
350 nm to 10 nm |
from
3.5 to 102 |
ultraviolet
|
| from
3*1016 hz to 3*1019 hz |
from
10 nm to 10-2 nm |
from
102 to 105 |
X-ray
|
| from
3*1019 hz to 3*1022 hz |
from
10-2 nm to 10-5 nm |
from
105 to 108 |
g-ray |
| from
3*1022 hz to 3*1023 hz |
from
10-5 nm to 10-6 nm |
from
108 to 109 |
cosmic
radiation |
radio
frequencies more common
LF:
low frequency,
long-wave or kilometric |
special
applications |
MF:
medium frequency,
medium-wave or hectometric |
broadcasting
to amplitude modulation and radio beacons |
HF:
high frequency,
short waves or dekametric |
communications
to very big distances |
VHF:
very high frequency,
ultra short waves or metric |
television,
broadcasting to frequency modulation, bridges radio, radar |
UHF:
ultra high frequency,
microwaves or decimetric |
"
"
"
" |
visible
electromagnetic wave
-
the numerical values are expressed in nanometer -
temperature
of color of some sources of light
| type
of source
|
temperature
of color Tc ( K )
|
| sun
to the dawn
|
=
1 850 |
| sun
after 1 hour
|
=
3 500 |
| sun
to summer noon
|
=
5 500 |
| moon
|
=
4 100 |
| covered
sky |
=
6 500 |
| covered
slightly sky
|
=
13 000 |
| intense
blue sky or north
|
=
25 000 |
| lamps
to incandescence
|
=
da 2 400 a 3 000 |
| lamps
from projection
|
=
da 2 850 a 3 200 |
| white
fluorescent lamps warm (warm)
|
=
3 000 |
| fluorescent
lamps white (white)
|
=
3 500 |
| fluorescent
lamps cool white (cold white)
|
=
4 500 |
| fluorescent
lamps daylight (diurnal)
|
=
6 500 |
photometric
quantity
| luminous
flow (lumen, lm)
|
=
1 lm = 1 cd*sr |
F = Q/t |
| luminous
intensity
|
=
1 cd |
I = F/w |
| light
amount |
=
lm*s |
|
| luminanza
(nit, nt)
|
=
1 nt = 1 cd/m2 |
L = I/S |
| illuminamento
(lux, lx)
|
=
1 lux = 1 lm/m2 |
E = F/S |
quantity
reported to the 1 candle
| candle
carcel |
~
9.6 |
| candle
hefner UK |
~
0.92 |
| internaional
candle (I. C. P.) |
~
1.02 |
| candle
Violle |
~
20 |
|
other
definition
| apostib
(asb) |
=
1/p nit |
| candle
power |
=
12.5664 lm |
| footcandle
|
=
10.76391 lux |
| footlambert
|
=
3.42625 nit |
| lambert
(L) |
=
3.18309*103 nit |
| phot
(ph) |
=
1*104 lux |
| stib
(sb) |
=
1*104 nit |
|
  
|
| Copyright ©
1999 -2010 THEmeter.net - All Rights Reserved - |
(ver.
#
23.03.08
)
|
|
