Chapter 1: Scientific Measurements

Length (Scientific measurement)

Meter

Kilogram

Mass

Liter

Volume

Kelvin

Absolute temperature

Celsius

Derived unit of temperature

What temperature (celsius) does water freeze?

0

What temperature does water boil (celsius)

100

Mega (M)

10^6

Kilo (K)

10³

Deci (d)

10^-1

Centi ©

10^-2

Milli (m)

10^-3

Micro

10^-6

Nano (n)

10^-9

1 m

100 cm

1m

1000 mm

1mm

1000 micrometers

1g

10000 mg

1mg

1000 millligrams

1kg

1000g

Weight in US customary units

Pounds and ounces

Length in US customary units

Yards, feet, inches

Volume of liquid in US customary units

gallons, cups, fluid ounces

1 in

2.54 cm

1m

39.37 in

1 ft

0.03048 m

1 yd

0.914m

1 lb

453.6 g

1 oz

28.35g

1 kg

2.205 lb

1g

0.035 oz

l mL

0.034 fl oz

1 qt

0.946 L

1 fl oz

29.594 mL

1 gal

3.785 L

Mean

average

Median

Middle value

Range

Difference between largest and smallest values of a data set

Standard deviation

Measure of variation in a data set

Large standard deviation

Measurements are far from mean

Small standard deviation

Measurements are close to mean

Precision

How close repeated values are to each other

Accuracy

How close measured values are to desired values

How to read meniscus?

At eye level

A student measures the boiling point of a liquid five times, obtaining values (101.2, 101.3, 101.1, 101.4, 101.3). If the true boiling point is 95, are the measurements precise, accurate, or both?

Precise but not accurate

When looking at a volume in a graduated cylinder, what do you look at to determine the volume?

Bottom of the meniscus at eye level