Chapter 1 Section 2

The way science works Critical thinking – to look at a problem from all directions in order to come up with the “Best” solution

Scientific tools Triple beam balance- Mass Metric ruler- length Beakers/flasks/ graduated cylinders- volume Thermometer- temperature Clock - time

System Internationale SI- standard set of measurements used world wide for consistency. Meter, Gram, Liter, second, Kelvin (note: Celsius is mostly used)

Conversions King Henry Danced Under Dim Crescent Moonlight. _K__ Kilo =1000 |_H__ Hecto =100 |_DA__ Deca = 10 |_U_ Base units m,g,l,  1 |_D__ Deci =.1  1/10th |_C__ Centi =.01  1/100th |_M__ Milli =.001  1/1000th

CONVERSIONS BETWEEN U.S. AND SI UNITS 1 mi = km 1 ft= m 1 inch = 2.54cm 1 gal = 3.8L 1 qt=.95L 1 pt = L 1lb =4.45 N

Making Measurements Length- meter, measured with a meter stick, large = kilo Volume- amount of space an object takes up Liter for liquids, meters cubed for solids Measure liquids with a graduated cylinder or ruler or h 2 o displacement

Making Measurements Mass – amount of matter in an object, unit is grams, measured with a triple beam balance Temperature- amount of heat in an object, units are Fahrenheit, Celsius, Kelvin, measured with a thermometer c is hot, 20 0 c is nice, 10 0 c is cold and 0 0 c is ice

Making Measurements Weight – measure of gravitational pull on an object, unit is Newton, measured with a scale. Density- mass of an object per unit of volume. D= M/V, Water (H 2 0)’s Density is 1g/ml Mass and volume may change but density does not. SI units are gram/liter 1mL=1cm 3