AIM: How is the volume of irregularly shaped objects measured? VOCABULARY Irregular shaped object Meniscus Increment Graduated Cylinder Overflow Can 11/11/2018

OBJECTIVE To successfully and accurately read the level in a graduated cylinder and measure the volume of irregularly shaped objects. 11/11/2018

DEFINITION What is volume ? Volume is the amount of space that matter (a solid, a liquid or a gas) takes up. 11/11/2018

For liquids, the standard (base) unit of measure for volume is the… In the Metric System For liquids, the standard (base) unit of measure for volume is the… Liter 11/11/2018

Basic Terminology 1 liter = 1000 milliliters 1 L = 1000 mL Remember…a milliliter takes up the SAME AMOUNT OF SPACE as a cubic centimeter (cm3) 11/11/2018

Metric Tool for Measuring Volume Graduated Cylinder In order to accurately use a graduated cylinder, there are a few important things to remember!!! 11/11/2018

What is the Meniscus? You have to read the level of the water at the meniscus What is a meniscus? A curve or blur in the water level 11/11/2018

Why do you think its important to read the meniscus at eye level? What is the Meniscus? Why do you think its important to read the meniscus at eye level? To obtain an accurate reading 11/11/2018

What is the Meniscus? Why should we keep the Graduated Cylinder as flat as possible during reading? To make sure that the level is even and the liquid level is accurate 11/11/2018

Lets Practice reading a graduated cylinder: The increment could be DIFFERENT on each cylinder Sometimes the increment is 1mL, other times its 5mL or even 0.5mL or 0.1 mL! You have to check! 11/11/2018

Lets Practice reading a graduated cylinder: What is the increment of this cylinder? What is the volume? Top of meniscus Bottom of meniscus 11/11/2018

Lets Practice reading a graduated cylinder: What’s the increment of this cylinder? What is the volume? 6 11/11/2018

Lets Practice reading a graduated cylinder: What’s the increment of this cylinder? What is the volume? 11/11/2018

Lets Practice reading a graduated cylinder: What’s the increment of this cylinder? What is the volume? 11/11/2018

Lets Practice reading a graduated cylinder: What’s the increment of this cylinder? What is the volume? 11/11/2018

What is this called? A rock 11/11/2018

How can you measure its volume? Can you measure its height, width, and length with a ruler? 11/11/2018

So how do you measure its volume? Water displacement method You’ll need a graduated cylinder or an overflow can 11/11/2018

Water Displacement Method Using your graduated cylinder Step 1: measure the volume of water 11/11/2018

Water Displacement Method Step 2: insert the rock in the water Re-measure the water in the cylinder! 11/11/2018

Water Displacement Method Step 3: Subtract the first measurement from the second. 11/11/2018

Water Displacement Method The difference in the measurements is the volume of the rock in mL 11/11/2018

Water Displacement Method …and since we know that 1mL = 1cm3, we know the volume of the solid object in 2 units!!! 11/11/2018