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Conversions and Calculating Scientific Data
+The Metric System
Scientists us the metric system to measure and calculate scientific data
The metric system is based on multiples of 10
+The Metric Staircase
+Mass
Mass is the amount of matter there is in an object
Everything has mass, even atoms
Mass is measured in grams
+Volume
Volume is the amount of space that an object occupies
Volume is measured in cm3
+Measuring Volume of Solids
There are two different methods used to measure volume of solid objects
Length x Width x Height
Water displacement method
Measured in cm3
+Measuring Volume cont.
When measuring the volume of a rectangular prism you multiply the objects length, width, and height
L x W x H
+Measuring Volume Cont.
When measuring the volume of a cube, you can take the measurement of any side and cube it, because all sides are equal.
53 is 5x5x5
Expressed as a3
+Measuring Volume Cont.
To find the volume of an irregularly shaped object, we use the water displacement method
To use the “water displacement” method you place the object in water and measure how much the water has risen
+Measuring Volume Cont.
Step 1: Measure the amount of water in the graduated cylinder
Step 2: Add object
Step 3: Measure the amount of water in the graduated cylinder with the object added
+Measuring Volume Cont.
Volume = final water level – starting water level
1 mL = 1 cm3
+Density
The relationship between the mass of an object and an object’s volume
The “compactness” of an object
+Measuring Density
Density = Mass/Volume
+Using Mass, Volume and Density
You can use mass, volume, and density together. If you know two of them, you can find the other.
+Density Cont.
Density is expressed in g/cm3
This is because Density is the amount of mass (g) per volume (cm3 )
+Temperature
The metric system measures temperature in degrees Celsius
The United States uses the standard unit, Fahrenheit
To convert Fahrenheit to Celsius: Tc = (Tf -32) x5/9
To convert Celsius to Fahrenheit: ((Tc+32)/9)x5
+Time
We measure time in seconds, minutes, hours, days, years…..
60 seconds in a minute
60 minutes in an hour
24 hours in a day
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