MeasurementMeasurement

The Standard The Standard Measurement SystemMeasurement System

Standard Measurement Standard Measurement SystemSystem (SI) (SI)

Universal Universal METRICMETRIC system used to system used to measure length, volume, mass, measure length, volume, mass, density, temperature, density, temperature,

& time& time

Based on multiples of 10Based on multiples of 10

LengthLength SI Unit of length is the Meter SI Unit of length is the Meter

(m)(m) Measures length & distanceMeasures length & distance

Using the metric ruler on your Using the metric ruler on your desk…desk…

1.1. Measure the object in front of Measure the object in front of you in centimeters.you in centimeters.

2.2. What is the measurement in What is the measurement in millimeters?millimeters?

3.3. One centimeter is divided into One centimeter is divided into how many millimeters?how many millimeters?

Weight vs. MassWeight vs. Mass WeightWeight is the measure of the force is the measure of the force

of gravity on youof gravity on you SI Unit of weight is Newtons (N)SI Unit of weight is Newtons (N)

MassMass is the measure of amount of is the measure of amount of matter (stuff) an object contains. matter (stuff) an object contains.

Scientists prefer to measure matter Scientists prefer to measure matter by its mass rather than weightby its mass rather than weight

MassMass Unit of Mass in SI Units is Unit of Mass in SI Units is Gram Gram

(g)(g) or or Kilogram (kg) Kilogram (kg) A triple-beam balance measures A triple-beam balance measures

mass in gramsmass in grams

Using a Triple Beam Using a Triple Beam Balance…Balance… Check to see that the Check to see that the PointerPointer is pointing to zero. is pointing to zero.

  If it is not, check to see that all the If it is not, check to see that all the RidersRiders are all are all the way to the left at the Zero mark. the way to the left at the Zero mark.

Adjust the balance by turning the Adjust the balance by turning the Adjustment  Adjustment  ScrewScrew slowly slowly until it points to zerountil it points to zero

A. The farthest (biggest) beam reads only in 100 g A. The farthest (biggest) beam reads only in 100 g increments.increments.B. The middle beam reads only in 10 g increments.B. The middle beam reads only in 10 g increments.The weights in each of these must always sit in a The weights in each of these must always sit in a "notch". They cannot be placed at arbitrary points "notch". They cannot be placed at arbitrary points on the beam.on the beam.C. The small beam on the front can be placed to C. The small beam on the front can be placed to read continuously from 0 to 10 grams. read continuously from 0 to 10 grams.

Measure the object in front of you in grams to the Measure the object in front of you in grams to the nearest 10nearest 10thth

VolumeVolume SI Unit of Volume is the SI Unit of Volume is the

Liter (L)Liter (L) Measures how much space Measures how much space

an object takes upan object takes up Commonly express volumes Commonly express volumes

in liters, milliliters, or cubic in liters, milliliters, or cubic centimeterscentimeters

Graduated cylinders Graduated cylinders measure liquid volumes measure liquid volumes

MeniscusMeniscus: When the top : When the top surface of the liquid is surface of the liquid is curved…measure at the curved…measure at the bottom of the meniscusbottom of the meniscus

VOLUME of Rectangular VOLUME of Rectangular Solids and Irregular SolidsSolids and Irregular Solids

Rectangular Solids:Rectangular Solids:

Volume = Length x Width x Volume = Length x Width x HeightHeight

Irregular Solids: Irregular Solids:

Submerge the object in a graduated Submerge the object in a graduated cylindercylinder

DensityDensity Density is Mass per unit Volume.Density is Mass per unit Volume. Two objects can have the same Two objects can have the same

volume, but very different densities.volume, but very different densities.

Density = Mass / VolumeDensity = Mass / Volume(kg/m(kg/m33) or (g/cm) or (g/cm33) or (g/mL)) or (g/mL)

Numerator is a measure of Numerator is a measure of mass, and the denominator is mass, and the denominator is

a measure of volumea measure of volume

Brain Break!Brain Break!

Turn to Textbook page 24. With your Turn to Textbook page 24. With your partner, solve the Math Sample partner, solve the Math Sample

Problem questions #1-2Problem questions #1-2

TemperatureTemperature SI unit of temperature is Celsius (C) SI unit of temperature is Celsius (C)

on the Celsius Scale. Water freezes on the Celsius Scale. Water freezes at 0 degrees C and boils at 100 at 0 degrees C and boils at 100 degrees Cdegrees C

SI unit of temperature is also the SI unit of temperature is also the Kelvin (K) on the Kelvin ScaleKelvin (K) on the Kelvin Scale