#  Length- the basic unit of length is the meter.  Meter- SI unit of length - It is the distance between the doorknob and the floor.

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 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 parts  A prefix and a base unit.  prefix tells you how many times to divide or multiply by 10.

 Length - meter - m  Mass - gram - g  Time - second - s  Temperature- Kelvin (K) or ºCelsius (ºC)  Volume - Liter - L

 kilo k 1000 times  hecto h 100 times  deca D 10 times  kilometer - equals 1000 meters or about 0.6 miles

 deci d 1/10  centi c 1/100  milli m 1/1000  centimeter - 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) 01234

 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 balance  First 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.

012345678910 0 20304050607080901000 200300400500

 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. khDdcm m L g

l Change 5.6 mg to kilograms. l starts at milli position and move six places to the left. Metric Conversions khDdcm m L g

 move the decimal point six places to the left 0.0000056  5.6 mg = 0.0000056 kg khDdcm m L g

 Change 5.6 m to millimeters  starts at the base unit position and move three places to the right. khDdcm m L g

 move the decimal point three to the right 5600.  5.5 m = 5600. mm khDdcm m L g

 convert 25 mg to grams  convert 0.45 km to mm  convert 35 mL to liters khDdcm m L g

 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 well you can perform some conversions!! Example problems 10 km = _____ dm 0.1 hm = _____ m 1cm = _____ hm 0.01 m = _____ mm 100 dg = _____ dag 10 hg = _____ kg 0.1 mg = _____ dg 0.001 cg = _____ mg 1 kg = _____ g 0.01 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). Notice that there is no degree sign used with the abbreviation. To covert from Celsius to Kelvin temperatures: C--> K+ 273 K--> C- 273 CelsiusKelvinFahrenheit Freezing: 0 273 32 Boiling: 100 373 212

Dervied units: are combinations of SI units. Volume: amount of space occupied by an object. Volume=Length X Width X Height V= l X w X h This is used to calculate the volume of a cube and combines three length measurements together. Density: the mass per unit volume of a material. Density=Mass/Volume D=m/V This is a combination of units of mass and volume.

Mass- find the mass of the object using a balance Volume- To find the volume by measuring the length, width, and height. Then calculate density=mass/volume

Mass- find the mass of the unknown using a balance Volume- 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.

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