Length- the basic unit of length is the meter.

Meter- SI unit of length - It is the distance between the doorknob and the floor.

Volume- is the amount of space that something occupies.

Liter - SI unit for volume ....- A little more than a quart ... - Solid objects can have volumes in cubic centimeters

Mass- is the amount of matter an object contains.

Kilogram- the basic SI unit for mass.◦About 2.25 pounds. ◦ A smaller unit is the gram.

Easier to use because it is a decimal system

Every conversion is by some power of 10.

Much easier to use when doing calculations.

A metric unit has two partsA prefix and a base unit.prefix tells you how many times to divide or multiply by 10.

Length - meter - mMass - gram - gTime - second - sTemperature- Kelvin (K) or ºCelsius (ºC)

Volume - Liter - L

kilo k 1000 timeshecto h 100 timesdeca D 10 timeskilometer - equals 1000 meters or about 0.6 miles

deci d 1/10centi c 1/100milli m 1/1000centimeter - 1/100 of a meter or less than half an inch

Line up from zero not the end of the ruler

Small numbered divisions are centimeters (parts are mm)

0 1 2 3 4

Use a graduated cylinder.

Hold it level with your eye.

Read the bottom of the curve.

Measures in milliliters mL.

A meniscus is the curvature of the surface of the water

10

20

30

Weight is a measure of the pull of gravity and, mass is the amount of matter.

The weight of an object can change, but an object’s mass is constant.

Use a triple beam balanceFirst zero the balance.Then place object on pan.Then move largest weight first, until pointer tips to right and move back one notch.

Move next smallest weight, until pointer tips to right and move back one notch.

Move smallest weight, until pointer is at mid-position.

When balanced, add up the weights.

0 1 2 3 4 5 6 7 8 9 10

0 10 20 30 40 50 60 70 80 90 100

0 100 200 300 400 500

Press on button to turn on.If balance in not on zero, press zero button.

Place object on pan and, record mass in grams.

Turn balance off at end of lab period.

how far you have to move on this chart, tells you how far, and which direction to move the decimal place.

k h D d c mmLg

Change 5.6 mg to kilograms.starts at milli position and

move six places to the left.

Metric Conversions

k h D d c mmLg

move the decimal point six places to the left 0.0000056

5.6 mg = 0.0000056 kg

k h D d c mmLg

Change 5.6 m to millimeters

starts at the base unit position and move three places to the right.

k h D d c mmLg

move the decimal point three to the right 5600.

5.5 m = 5600. mm

k h D d c mmLg

convert 25 mg to gramsconvert 0.45 km to mmconvert 35 mL to liters

k h D d c mmLg

Density- tells you how much matter is packed into a given volume.

Calculated by dividing mass by volume ( D = M ) . V

Calculate the density of an object with a mass of 25 g & a volume of 5.0 mL.

.D = M = 25 g = 5.0 g/mL . V 5.0mL

Now let’s see how wellyou can perform someconversions!!

Example problems

10 km = _____ dm0.1 hm = _____ m1cm = _____ hm0.01 m = _____ mm100 dg = _____ dag10 hg = _____ kg0.1 mg = _____ dg0.001 cg = _____ mg1 kg = _____ g0.01 dag = _____ cg

temperature (K) = temperature (°C) + 273.15

the melting point of water is = 0°C = 273.15 K

the boiling point of water is = 100°C = 373.15 K

*is the temperature at which the vapor pressure of a liquid is one

atmosphere.

*Units - K (Kelvin)

the melting point of water = 32°F the boiling point = 212°F.

The SI unit of temperature is Kelvin (K). Noticethat there is no degree sign used with the abbreviation.

To covert from Celsius to Kelvin temperatures:C--> K + 273K--> C - 273

Celsius Kelvin FahrenheitFreezing: 0 273 32Boiling: 100 373 212

Dervied units: are combinations of SI units.Volume: amount of space occupied by an object.Volume=Length X Width X HeightV= l X w X hThis is used to calculate the volume of a cube andcombines three length measurementstogether.

Density: the mass per unit volume of a material.Density=Mass/VolumeD=m/VThis is a combination of units of mass and volume.

Mass- find the mass of the objectusing a balanceVolume- To find the volume by measuring the length, width, and height. Then calculate density=mass/volume

Mass- find the mass of the unknownusing a balanceVolume- To find the volume, first measure the water that can immerse the irregular object in a graduated Cylinder. Then dropped the object in the cylinder and note the displacement measurement.Density = mass/volume.