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Transcript of Measurement
that includes a number and a unit
Ex:7 cm, 5.2 mL reasonable guess based on observation
ex: about 2 meters, more than 15 minutes Length & Distance base unit is the meter (m) What tools can be used to measure distance and length? units we will use:
Kilometer (Km) = about 10 football fields
meter (m) = think "meter stick"!
centimeter (cm) = width of little finger
millimeter (mm) = thikness of dime tools we use to measure:
ruler, meterstick, tape measure, trundle wheel
When would we use each? Volume amount of space an object takes up
base unit is Liter (L) Liter (L) - half of a 2L soda bottle milliliter (mL) - one teaspoon holds about 5 of them 1 mL = 1 cc (cubic cm) Mass a measure of how much matter (or stuff) is in an object the base unit is grams (g) most common prefixes?
milligram (mg) measured with a balance Density measure of how much matter (stuff) is packed into a space it is a calculated measurement: it cannot be measured directly
D = m/V it can be used to help identify an unknown substance measured in g/cm^3 Common Prefixes:
kilo- = x1000
hecto- = x100
centi- = 1/100
milli- = 1/1000 stands for Systeme International Why do scientists need an "international system"? also known as the metric system precision how detailed or exact a measurement is
ex: a watch that can measure to 0.01 sec accuracy how close a measurement is to "correct"
Ex: watch set to the correct time Time how much time something takes to happen usually measured in seconds (s)
also minutes (min) or hours (hr) min sec hundredths can tell us if something will float Temperature repeatable measurement the amount of heat energy in a substance or object which side will we use? science uses the metric temperature scale:
Celsius (°C) water boils at 100 °C ice melts (or water freezes) at 0 °C human body temp = 37 °C room temp is about 22 °C Metric Conversions what measurement would you make? meniscus 5.9 mL