Measuring LengthMeasuring Length

SI Measurement SystemSI Measurement System

International System of UnitsInternational System of Units

Developed out of a need for a global Developed out of a need for a global measurement system.measurement system.

Advantages of the SI SystemAdvantages of the SI System

Helps all scientists share and Helps all scientists share and compare their observations and compare their observations and results.results.

Based on the number 10, which is Based on the number 10, which is easy to use in calculations.easy to use in calculations.

SI Measurement SystemSI Measurement System

LengthLength LengthLength is is the long the long

dimension of any of any object. (the distance object. (the distance between its ends) between its ends)

Tool Tool meterstick meterstickBase Unit Base Unit Meter (m)Meter (m)

To Be Continued…To Be Continued…

Now: Let’s Measure!!!Now: Let’s Measure!!!

Measuring VolumeMeasuring Volume

VolumeVolume

The amount of space an object The amount of space an object occupies.occupies.

Tool Tool graduated cylinder graduated cylinder Base Unit Base Unit Liter (L)Liter (L)

1 liter = 1,000 Milliliters1 liter = 1,000 Milliliters

Measuring VolumeMeasuring Volume Irregular ObjectsIrregular Objects

Water Water DisplacementDisplacement

Put the object in a Put the object in a graduated cylinder graduated cylinder containing water containing water and measure the and measure the change in volume change in volume of the water.of the water.

Measuring VolumeMeasuring Volume Rectangular ObjectsRectangular Objects

Volume = Length x Width x HeightVolume = Length x Width x Height Measured in mMeasured in m33 or cm or cm33

To Be Continued…To Be Continued…

Now: Let’s Measure!!!Now: Let’s Measure!!!

Measuring MassMeasuring Mass

MassMass

The measurement of how much The measurement of how much matter an object contains.matter an object contains.

Tool Tool triple beam balance triple beam balance Base UnitBase Unit

gram (g)gram (g)

1 kilogram = 1,000 grams1 kilogram = 1,000 grams

WeightWeight

The measurement of the force of The measurement of the force of gravity on mass.gravity on mass.

Weight or Mass?Weight or Mass?

An object’s weight will change if you An object’s weight will change if you move it from Earth to the moon or to move it from Earth to the moon or to other planets, but its mass will stay other planets, but its mass will stay the same.the same.

Measuring DensityMeasuring Density

The measurement of how much mass The measurement of how much mass is contained in a given volume.is contained in a given volume.

Which means how closely packed or Which means how closely packed or crowded an object is.crowded an object is.

Most of the time solids are more dense than Most of the time solids are more dense than liquids.liquids.

Which box is more dense?Which box is more dense?

Measuring DensityMeasuring Density

Which tool(s) do you think would be Which tool(s) do you think would be used to measure density?used to measure density?

Calculating DensityCalculating Density

Density = Mass/VolumeDensity = Mass/Volume

Units:Units:

g/cmg/cm33

oror

g/mlg/ml

Density FactsDensity Facts

Less dense objects will Less dense objects will “float” on top of more dense “float” on top of more dense objects.objects.

For example, oil will float on For example, oil will float on water.water.

Oil is less dense than water.Oil is less dense than water.

Density FactsDensity Facts The density of a substance is the The density of a substance is the

same for all samples of that same for all samples of that substance.substance. For example, at 4For example, at 4ooC pure water has a C pure water has a

density of 1 g/cmdensity of 1 g/cm33

Density FactsDensity Facts

For example, all samples of pure gold For example, all samples of pure gold have a density of 19.3 g/cmhave a density of 19.3 g/cm33..

Fools gold has a density of 5.0 g/cmFools gold has a density of 5.0 g/cm33

TemperatureTemperature

A measure of how hot (or cold) A measure of how hot (or cold) something is.something is.

Tool Tool thermometer thermometer Base UnitBase Unit

Celsius (Celsius (ooC) C)