Flashcards: Chapter E - Unit conversion

1) All nonzero digits are significant

2) Zeroes between nonzero digits are significant

3) Leading zeros to the left before a nonzero digit are NOT significant

4) Trailing zeroes to the right after a decimal point are significant

5) Trailing zeroes to the right before a decimal point and after a nonzero digit are significant

6) Trailing zeroes before an implied decimal point are NOT significant

Your answer should have the same number of digits after the decimal as the term with the fewest decimal places

Your answer should have the same number of significant figures as the term with the fewest

1) Use PEMDAS like usual and mark the least significant figure or decimal place INSIDE the parentheses according to A/S or M/D.

2) Using that mark, follow the significant figure rules for operations outside the parentheses

1 m = 100 cm = 1000 mm

1 cm = 10 mm

1 mm = 0.1 cm = 0.001 m

1 in = 2.54 cm

1 km = 1000 m

1 m = 0.001 km

1 mi = 1.61 km

1 km = 0.621 mi

0 K = - 273 C° or - 459 F°

C° = (F° - 32) ÷ 1.8

F° = (1.8 · C°) + 32

m³

- volume measures the space taken up by a substance

d = mass ÷ volume

- density measures the ratio of of substance's mass to the space (volume) it takes up

1 gal = 3.78 L

1 L = 1000 mL

1 mL = 0.001 L

1 mL = 1 cm³

1 in³ = 16.39 cm³

1 cm³ = 0.061 in³

1 kg = 2.20 lb

1 lb = 0.454 kg

1 kg = 1000 g = 1,000,000 mg

1 g = 1000 mg

1 mg = 0.001 g = 0.000001 kg

Kilo = 1000 → 10³

Centi = 0.01 → 10^-2

Deci = 0.1 → 10^-1

Milli = 0.001 → 10^-3

Micro = 0.000001 → 10^-6

Nano = 0.00000001 → 10^-9