LAMC SSC Title V HSI Created by: Aramik Yousefian Presented by : Lilit Haroyan

Length So, 3 ft = m Relations of U.S. and Metric Units 1 in = 2.54 cm (exact) 1 yd = m (exact) 1 mi = km Relations in U.S. units 1 mi = 5280 ft 1 mi = 1760 yd 1 ft = 12 in

Mass Relations of U.S. and Metric units 1 lb = kg 1 oz = g Relations in U.S. units 1 lb = 16 oz Kilogram kg

More Conversion Examples A cooler has a capacity of 5500 ml. What is the capacity in Liters? Ethyl alcohol has density of 0.79 g/ml. What is the volume in ml of 1.5kg of alcohol? How many ml of olive oil (d=0.92g/ml) weigh the same as 1.2L of gasoline (d=0.66g/ml) 5500 ml 1 L x 1000ml = 5.5 L 1000 g 1.5 kg x 1 kg 1 ml x 0.79 g = 1900 ml 1.2 L gas 1000 ml x 1 L 0.66 g x 1 ml = 792 g gas mass of olive oil = mass of gasoline = 792 g 1 ml 792 g oil x 0.92 g = 860 ml

Put the decimal after the first digit. After the decimal place, there are 11 places left So, we drop the zeros and write… 1.23 x 10 11

Write in scientific notation × 10 –11 Convert to scientific notation × 10 – × 10 –9

All non-zero digits are always significant. All non-zero digits are always significant. All zeros between two significant digits are always significant. All zeros between two significant digits are always significant. All zeros before the first non-zero digit are never significant. All zeros before the first non-zero digit are never significant. All zeros after the last non-zero digit and after the decimal are always significant. All zeros after the last non-zero digit and after the decimal are always significant. Trailing zeros before the decimal are ambiguous and therefore assumed to not be significant. Trailing zeros before the decimal are ambiguous and therefore assumed to not be significant

sig figs sig figs sig figs sig figs

Rounding Decimals 0,1,2,3 and 4 are always rounded down 5,6,7,8 and 9 are always rounded up rounded to hundredths is rounded to tenths is rounded to 3 decimal places is Rounding whole Numbers rounded to tens is ,690 rounded to thousands is 13, rounded to units is 1

Significant digit calculations multiplication and division When multiplying or dividing numbers, the answer must contain the same number of significant figures as the measurement with the lowest number of significant figures. addition and subtraction When adding or subtracting numbers, the answer must contain the same number of decimal places as the measurement with the lowest number of decimal places. (1.353) x (0.12) = 1.6 (15.12) + (5.8) = 20.9

MoreCalculations More Calculations (3.5) (4.544) = x 0.22 = = =

77 77 = 77% = 77% = 96% = 96%100

Percentage Calculation What is 35% of 68? X 35 X 35 = X (68)(35) = X = is 35% of is what percentage of 80? 15 X 15 X = X (15)(100) 80X (15)(100) = X = 19 19% of 80 is 15.

your result - accepted value % error = X 100 accepted value Also written as experimental value - theoretical value % error = X 100 theoretical value

A student measures the volume of a 1.50 liter container to be 1.67 liters. What is the percent error in the student's measurement? Experimental Value: 1.50 L Theoretical value: 1.67 L % error = X X 100 = 10% error