Some common units of measurement for circuit boards

Summary of content: Some common units of measurement for circuit boards

1 foot = 12 inches

1 inch inch = 1000 mil

1mil = 25.4um

1mil = 1000uin Milmil sometimes becomes English silk

1um = 40uin (some companies call microinches wheat, in fact microinches)

1OZ = 28.35 grams / square foot = 35 microns

H = 18 microns

4mil / 4mil = 0.1mm / 0.1mm line width and space

1ASD = 1Amp / dm2 = 10.76Amp / sqft

1 AM=1Amp-minute=60Coulomb is mainly used for precious metal plating such as gold plating

1 square decimeter = 10.76 square feet

1 ounce = 28.35 grams, this is an English unit

1 gallon (imperial) = 4.5 liters

1 gallon US system = 3.785 liters

1KHA = 1000 ampere hours

1 amp hour = 3600 coulombs

Specific gravity

Baume degree = 145-145 / specific gravity SG.

SG. Specific gravity (g / cm3) = 145 / (145- Baume degree)