Measurement in Science
Units of Measurement
〉
How do scientists measure things?
Measurement
uses numbers to describe
processes and events
•
Metrology
is the study of measurement. This
term comes from the Greek words metron
which means “measure” and logos which
means “study of.”
4 Common Measurements
•
length:
a measure of the straight-line distance between
two points
–
Base Unit – Meter - m
•
mass:
a measure of the amount of matter in an object
–
Base Unit – Gram - g
•
weight:
a measure of the gravitational force exerted on
an object
–
Base Unit – Newton - N
•
volume:
a measure of the size of a body or region in
three-dimensional space
–
Base Unit – cubic centimeter – cc or cm
3
or ml
Volume
The International System of Units is known
as SI from its French name
Systeme
International d’Unites
.
SI units are the current world
standard for measurement. There
are seven basic SI units. They are
the meter, kilogram, second,
ampere, kelvin, mole, and candela.
SI
(Le Système Internationale d’Unités)
Conversions
Conversions
Common Conversions
•
100 c
m
= 1
m
•
1000
m
= 1 k
m
•
1000 m
m
= 1
m
•
1 km = 0.62 mi
•
1 kg = 2.2 lbs
•
1 hr = 60 min
•
1 min = 60 s
•
3600 s = 1 hr
Conversions
•
Convert your mass in lbs to kg.
1 step – conversions
•
1000 cm = ? m
•
45 mg = ? g
•
800 kL = ? L
•
200 lbs = ? Kg
–
1kg = 2.2 lbs
2 step - conversions
•
100 cm = ? km
•
8 kg = ? cg
•
4500 g = ? Lbs
•
50 m
2
= ? cm
2
Complex Conversions
•
10 m/s = ? mi/h
•
1200 cg = ? Lbs
•
5 cm
3
= ? m
3
Conversion Practice
•
45 mg = ? g
•
800 L = ? cL
•
8 km = ? m
•
5 miles = ? km
•
0.62 miles = 1 km
Common Metric – English Conversions
•
Length
–
1 in. = 2.54 cm
–
1 m = 3.281 ft
–
1 yd = 0.9144 m
–
1 km = 0.62 mi
•
Volume
–
1 L = 1.06 qt
–
1 ml = 1cm^3
•
Mass
–
1 kg = 2.2 lbs
–
1000 kg = 1 t (metric ton)
•
Force
–
1 lb = 4.48N
•
Time
–
365 days = 1 year
–
1 day = 24 hr
–
1 hr = 60 min
–
1 min = 60 s
–
3600 s = 1 hr
Scientists measure various quantities using units such as length, mass, weight, and volume. The International System of Units (SI) provides a standard framework for measurements. Conversions between different units are common in scientific calculations, facilitating accurate and consistent measurements across disciplines.
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Presentation Transcript
Units of Measurement How do scientists measure things?
Measurement uses numbers to describe processes and events Metrology is the study of measurement. This term comes from the Greek words metron which means measure and logos which means study of.
4 Common Measurements length: a measure of the straight-line distance between two points Base Unit Meter - m mass: a measure of the amount of matter in an object Base Unit Gram - g weight: a measure of the gravitational force exerted on an object Base Unit Newton - N volume: a measure of the size of a body or region in three-dimensional space Base Unit cubic centimeter cc or cm3or ml
The International System of Units is known as SI from its French name Systeme International d Unites. SI units are the current world standard for measurement. There are seven basic SI units. They are the meter, kilogram, second, ampere, kelvin, mole, and candela.
Conversions Common Conversions 100 cm = 1 m 1000 m = 1 km 1000 mm = 1 m 1 km = 0.62 mi 1 kg = 2.2 lbs 1 hr = 60 min 1 min = 60 s 3600 s = 1 hr
Conversions Convert your mass in lbs to kg.
1 step conversions 1000 cm = ? m 45 mg = ? g 800 kL = ? L 200 lbs = ? Kg 1kg = 2.2 lbs
2 step - conversions 100 cm = ? km 8 kg = ? cg 4500 g = ? Lbs 50 m2 = ? cm2
Complex Conversions 10 m/s = ? mi/h 1200 cg = ? Lbs 5 cm3 = ? m3
Conversion Practice 45 mg = ? g 800 L = ? cL 8 km = ? m 5 miles = ? km 0.62 miles = 1 km
Common Metric English Conversions Force 1 lb = 4.48N Length 1 in. = 2.54 cm 1 m = 3.281 ft 1 yd = 0.9144 m 1 km = 0.62 mi Volume 1 L = 1.06 qt 1 ml = 1cm^3 Mass 1 kg = 2.2 lbs 1000 kg = 1 t (metric ton) Time 365 days = 1 year 1 day = 24 hr 1 hr = 60 min 1 min = 60 s 3600 s = 1 hr
