3.2 The SI System of Measurement

Question 1

The SI System

Answer 1

The International System of Units (SI)

• The main system of measurement units used in science
• internationally agreed upon since 1960s
• “Modern” metric system
• abbreviated from Le Système International d’ Unites

Question 2

Mass

Answer 2

The measure of the amount of matter within an object

-remains constant regardless of location

Question 3

Weight

Answer 3

The force of the attraction between an object and the Earth (or other large, gravity-producing body on which the object is located)

• due to the force of gravity
• weight is not constant

Question 4

SI Unit of Mass

Answer 4

kilogram (kg) = 1,000 g

Question 5

Length

Answer 5

The measurement of something from end to end

Question 6

SI Unit of Length

Answer 6

meter (m)

Question 7

Volume

Answer 7

The amount of space taken up by an object

Question 8

Derived Units

Answer 8

Units of measurement that are defined in terms of other SI base units

Question 9

SI Unit of Volume

Answer 9

Cubic Meter (cm^3)
-based on the meter, the SI unit of length

Question 10

Relationship Between cm^3 and Ls

Answer 10

1.00 mL = 1.00 cm^3

Question 11

Temperature

Answer 11

The average kinetic energy of the particles that make up a material
-increasing the temperature of a material increases its thermal energy

Question 12

Temperature vs. Heat

Answer 12

Thermal energy…contained vs. transferred

Question 13

Heat

Answer 13

The amount of thermal energy transferred from a warmer object to a cooler object

Question 14

Thermometer

Answer 14

Device that measures temperature

-“thermo” means “heat,” “meter” means “to measure”

Question 15

B/F Points of Water (degrees Fahrenheit)

Answer 15

Freezing point = 32
Boiling point = 212
Distance divided by 180 degrees

Question 16

B/F Points of Water (degrees Celsius)

Answer 16

Freezing point = 0
Boiling point = 100
Distance divided by 100 degrees

Question 17

Absolute Zero

Answer 17

The temperature at which molecules stop moving and therefore have zero kinectic energy

Question 18

Kelvin Temperature Scale

Answer 18

-0 is absolute zero (-273.15 degrees C)
-Same degree size as Celsius scale
-K = C + 273.15
-No degree sign used
Freezing point = 273.15 K
Boiling point = 373.15 K

Question 19

delta T

Answer 19

The difference between two temperatures
Ex. 20 degrees C = 293 K
50 degrees C = 323 K
Difference between C temps = 30
Difference between K temps = 30

Question 20

SI Unit of Time

Answer 20

second

Question 21

Metric and SI Base Units??

Answer 21

Base units differ from basic units.
Base unit of mass = gram
Basic unit of measurement for mass = kilogram