1 ft = 12 inches

1 inch inch = 1000 mil mil

1 mil = 25.4 um

1 mil = 1000 uin mil mil sometimes into the wire

1 um = 40 uin (some companies call micro inches, is actually a micro inches)

1 oz = 28.35 g/square foot = 35 microns

H = 18 microns

4 mil / 4 mil line width = 0.1 mm / 0.1 mm line spacing

1 asd = 1 amp/square decimeter = 10.76 amps/square feet

1 am = 1 amp minutes = 60 coulomb is mainly used for precious metal plating, such as gold plated

1 square decimeter = 10.76 square feet

1 oz = 28.35 grams, this is English unit

1 gallon (imperial) = 4.5 liters

1 gallon american-made = 3.785 liters

1 kha = 1000 hours

1 ampere hour = 3600 coulomb

The proportion of

Baume degree = 145-145 / proportion of SG.

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