References

[last updated: 2023-12-19]
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• AC outlet & cord config
• ASCII table
• HDMI plug configurations
• screw sizes
• wire sizes and ampacity
• trig tables
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  Units:

• pico = 10^-12
  nano = 10^-9
  micro = 10^-6
  milli = 10^-3
  kilo = 10³
  mega = 10⁶
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  Conversion factors:

• volume:
  • 1 gal = 3.785 liters
    1 liter = 0.264 gal
  • 2 Tbs / oz
    16 Tbs / cup
  • 3 tsp / Tbs
  • 100 drops / tsp

• pressure:
  • Pa = pascals
    1 hPa = 100 Pa
    1 psi = 6894.76 Pa = 68.95 hPa
    1 hPa = 0.0145 psi
    1 MPa = 145 psi

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• Magnetic Fields:
  • Magnetic Field Strength (in SI units) is H, amps/meter.
  • Magnetic Flux Density is B , in Tesla (SI: kg / sec² / amp )
  • Field strength is measured in units of Gauss or Tesla.
    1 T = 10⁴ G

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• mcd to lm:
  from: https://www.rapidtables.com/calc/light/mcd-to-lumen-calculator.html
  Millicandela to lumens calculation

  For uniform, isotropic light source, the luminous flux Φv in lumens (lm) is equal to the luminous intensity Iv in millicandela (mcd),
  times the solid angle Ω in steradians (sr) divided by 1000:

  Φv(lm) = Iv(mcd) × Ω(sr) / 1000

  The solid angle Ω in steradians (sr) is equal to 2 times pi times 1 minus cosine of half the apex angle θ in degrees (°):

  Ω(sr) = 2π(1 - cos(θ/2))

  The luminous flux Φv in lumens (lm) is equal to the luminous intensity Iv in millicandela (mcd),
  times 2 times pi times 1 minus cosine of half the apex angle θ in degrees (°) divided by 1000:

  Φv(lm) = Iv(mcd) × ( 2π(1 - cos(θ/2)) ) / 1000

  So: lumens = millicandela × ( 2π(1 - cos(degrees/2)) ) / 1000

  Or: lm = mcd × ( 2π(1 - cos(°/2)) ) / 1000

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• lux to lumens:
  1 lux = 1 lumen/m²

  
  If a 10,000 lumen bulb shines on a 1 m² area,
  then it has a "luminous intensity" of 10,000 lux.
  Note that all of the light from the bulb
  must be focused on the 1 m² area,

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• BB weights:
  • Standard bb's are 0.18" (4.6mm) diameter
    they weight: 0.278 g each
  • 2mm steel balls are:
    0.0334 g each

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