SI Units & Measurement (System International) H.Smith.

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Presentation transcript:

SI Units & Measurement (System International) H.Smith

Why?

Base Units Length: meter Mass: gram Volume: liter Time: second Temperature: Kelvin (Celsius + 273) Area: meter 2 Density: kg/m 3

Why Use Kelvin instead of Celsius 0 ° Kelvin is absolute zero: complete absence of heat, coldest it can be in the universe. 0 ° K is -273 ° C So…to get ° K from ° C you add 273 °.

Prefixes Kilo: 1000 Centi: 1/100 Milli: 1/1000 Ex: 1 kilogram=_________gram(s) Ex: 1 meter = ___________ cm(s) Ex: 1000 milligrams=____________gram(s)

Usage: When to use each prefix? – Kilo: large amounts – Regular base: medium – Milli: small amounts. -To measure the volume of 1 drop of water… -To measure the mass of Ms. Smith… -To measure the length of the science hallway…

Practice: To measure… 1. The surface area of a pond: 2. The distance between Rome & Paris: 3. The melting point of gold: 4. The distance an amoeba travels in 1 second: 5. The mass of a bacterial colony: 6. The volume of a 22 oz Coke:

Calculating the mean Mean = average. To determine: add numbers together and divide by amount of entries. Ex: What is the average water temperature in the samples below?

Relationships to English Units 1 meter = 3 ft 3 inches 1 mile = 1.6 kilometers 1 gallon = 3.7 liters 1 inch = 2.5 centimeters 1 ft = 30 cm 1 kg = 2.2 lbs.

Analogous units The mile is analogous with… The inch is analogous with… The pound is analogous with… The gallon/quart is analogous with… The foot/yard is analogous with…

Conversions How many kilometers are there in 5 miles? How many inches are there in 16 cm?

Conversions within metric: How many liters are there in 3.6 gallons? How many lbs in 63 kgs?