Lesson 2

Raindrops Keep Falling

Measuring Liquids

We measure rainfall by inches because volume is dependent on what container you measure it. Volume increases at a steady and predictable way in relation to the height of the beaker.


Proportional - 2 variables are directly proportional when you can multiply the value of one by a constant to obtain the value of the other.

Proportionality constant - number that relates two variables that are proportional to each other, represented by a lowercase k.

Ex: y=5x - the y and x are proportional to each other because one is being multiplied by the constant k(5).

Graphs of one variable is proportionate to another if the line of the two variables pass through the origin of the graph or point (0,0).

Practice Problems

4. Same volume different height.

5. No because some would overflow because they aren't as big and some like the tub would hold more water.

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