OATMEAL TREATS
Combine together the following ingredients:
some butter
some sugar
a little salt
a lot of flower
a bunch of nuts
a whole lot of oatmeal
a little baking powder
Mix well, heat up the oven, and bake for a long time
What is wrong with this recipe?
Are measurements important?
METRIC SYSTEM
Developed in 1791 and is currently used almost
everywhere in the world, except the US. Our
scientists, hospitals, researchers, etc use this
system.
Système International d'Unités
International System of Units or SI
Based on the number
10
Prefixes, Numbers and Symbols
1000
100
10
0.1
How to remember the staircase?
0.01
0.001
King Henry Doesn’t Usually Drink Chocolate Milk
LENGTH is the distance between 2 points.
The standard unit is the meter. 1m = 39.4 inches
Measuring instrument meter stick
ruler
Smaller objects are measured using the cm. 2.5cm =1 inch
100cm = 1m
Even smaller objects are measured using the mm.
Long distances = km
1km = 1000m
1 km = .62 miles
How many miles would
you run in a 5km race?
Standard unit is the liter = l or
L.
Small amounts = mL
_______mL = 1 L
The amount of
space an object
occupies.
LARGE amounts = kl
________L = 1 kl
How many kl is 3250L ? 3.250kl
What instrument is used to find the
volume of a liquid?
graduated cylinder
Graduated cylinder
When measuring liquid volume it is important to read the
graduated cylinder correctly. You eye should be level with the top
of the liquid and you should read the bottom of the meniscus.
You would read this as
________
How may mL is showing in these graduated cylinders?
Volume of rectangular solids
Width = 5cm
Height = 4cm
length
10cm
Formula:
V = length x width x height
Find the volume of the box.
200cm3
VOLUME
What would the volume of a cube that has the l = 1cm, w = 1cm,
and the h = 1cm be?
1cm3
A 1cm3 hollow cube holds __ml of H2O, therefore
1000cm3 = ____ ml or 1 ___
MASS:
The amount of matter in an object.
Instrument used to find mass:
Triple beam or electronic balance
Standard unit is the kilogram kg
1 kg = 2.2 lbs
Calculate your weight in kg. __________kg
Common unit - the gram. A large paper clip masses about 1g.
Extremely small items are massed using mg for the unit.
1 g = _____ mg. How many mg would = 1kg?
____________mg
What is the mass on the balance?
Triple Beam Balance
The weight of a can of Diet DEW is?
http://genchem.rutgers.edu/bal3b2.html
______________________
Weight
A measure of attraction between two objects due to gravity
Standard unit = Newton (N)
A 1kg object is pulled to Earth at a rate of 9.8 newtons, so
the weight would = 9.8N. Weight = mass x 9.8 newtons
(on Earth at sea level).
Note gravitational pull would be less on a mountain than at
sea level, b/c you are farther away from the center of Earth.
Calculate your weight. Use your mass from the
mass page.
DENSITY
The amount of matter that occupies a space
D = mass (g)
volume (cm3)
48 g
2cm
4cm
3cm
V= 2cm x 3cm x 4cm
V= _______
D=
19.3 g/cm3
The density of water is 1.0g/cm3
TIME
the interval between two events
Standard unit is the
__________
Common units are minutes and
hours
TEMPERATURE
Unit
Absolute
zero
Water
freezes
273º
Kelvin
K
0
Celsius
ºC
-273º
Fahrenheit
ºF
-459.67º
Water
boils
212º
Conversion Formulas
[°C] = [K] − 273
[K] = [°C] + 273
[°F] = [°C] · 9/5 + 32
[°C] = ([°F] − 32) · 5/9