Measurement

Why do we care?

In order for measurement to be useful, a measurement standard must be used.

Measurement Standard

In science we use SI Units (Systeme Internationale) as our standard.

A standard is – an exact quantity that people agree to use for comparison.

These units can measure time, temperature, mass, volume, length, etc

SI Units

• SI Unit for Mass ___________________________________

• SI Unit for Length __________________________________

• SI Unit for Temperature _____________________________

• SI Unit for Time ____________________________________

• Common Unit for Volume _____________________________

Gram (g)

Second (s)

Kelvin (k)

Meter (m)

Liter (L)

More on Time & Temperature

We will be working on measuring length, mass, and volumein upcoming lessons.

Time (seconds) – The interval between events. A stopwatch or clock measure time.

Temperature (kelvin) – Measures the heat energy of an object. A thermometer measures temperature

Did you know?

Time is NOT constant

Did you know?

“Cold” does not actually exist

Absolute Zero

Fun with Liquid Nitrogen

Why “Kelvin”?What the heck is “Kelvin”

0 K is absolute zero!

Heat makes molecules move. At 0 (zero) K, all molecules are completely still. No heat energy is present!

Celsius to Kelvin

How do you convert Celsius to Kelvin???

• To convert Celsius to Kelvin you simply add 273.

□ 10 °C = __________K

□ 48 °C = __________K

□ 326 °C = __________K

• To convert Kelvin to Celsius you simply subtract 273.

□ 273 K = __________°C

□ 380 K = __________°C

□ 10 K = __________°C-263

107

0

599

321

283

More on Measurement

Scientists work with very large numbers and very small numbers. They use something called “scientific notation” to avoid using measurements like…

93,000,000,000,000,000 units.000029300018283000003 units

If you measured this way, LOTS of ERRORS would occur.

So, scientists convert by bases of 10….

The Magical Metric StaircaseKilo (K)

Hecto (H)

Deca (D)

Base (B)

Deci (D)

Centi (C)

Milli (M)

king

henry

died

by

drinking

chocolate

milk

1000

100

10

1

.1

.01

.001

Base = grams, meters, etc

grams

grams

grams

grams

grams

grams

1 kilogram = 1000 grams

1 hectogram = 100 grams

1 decagram = 10 grams

1 decigram = .1 grams

1 gram = 1 gram

1 centigram = .01 grams

1 milligram = .001 grams

.

.

.

.

The Magical Metric StaircaseKilo (K)

Hecto (H)

Deca (D)

Base (B)

Deci (D)

Centi (C)

Milli (M)

1000

100

10

1

.1

.01

.001

grams

How to CONVERT

ALL numbers have a decimal. First, find the decimal.

A blue whale is 3100 centimeters long….is there an easier way to tell the length than saying 3100 centimeters?

Kilo (K)

Hecto (H)

Deca (D)

Base (B)

Deci (D)

Centi (C)

Milli (M)

1000

100

10

1

.1

.01

.001

meters

Move the decimal LEFT if converting up.

Move the decimal RIGHT if converting down.

Example: A blue whale is 3100 centimeters long….is there an

easier way to tell the length than saying 3100 centimeters?

3100. cm

310.0 dm

31.00 m

Kilo (K)

Hecto (H)

Deca (D)

Base (B)

Deci (D)

Centi (C)

Milli (M)

1000

100

10

1

.1

.01

.001

meter

Move the decimal LEFT if converting up.

Move the decimal RIGHT if converting down.

Example: A tiny amoeba is .0004 m long. Is there an

easier way to give the length of the amoeba?

.0004 m

0.004 dm

00.04 cm.4 mm

The distance from Holley to Lake Ontario is 16576.2 meters…..is there an

easier way to tell the distance?

Kilo (K)

Hecto (H)

Deca (D)

Base (B)

Deci (D)

Centi (C)

Milli (M)

1000

100

10

1

.1

.01

.001

meters

Move the decimal LEFT if converting up.

Move the decimal RIGHT if converting down.

Example: The distance from Holley to Lake Ontario is 16576.2 meters…..is there an easier way

to tell the distance?

16576.2 m

1657.62 dam

165.763 hm

16.5763 km