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## Measuring Liquid Volume

#### Grade 3 Measurement - 3.MD.A.2

How to Measure Liquid Volume - Do you purchase water bottles or soft drinks? Do you see the numbers on the bottle with liters (l) or milliliters (ml) written beside it? Well, this number with these units is the volume of liquid in the bottle. It is easy to know the volume of a liquid in a sealed water bottle or bottle of soft drink, but when the volume of the liquid is unknown, you will not know until you make efforts. Method 1 - The first method is a straightforward technique to measure the volume of a liquid. For this, you need graduated cylinders. These cylinders have markings on them through which we can measure the volume. Before you note down the value, you need to make sure to use the liquid’s meniscus to measure the volume. Method 2 - The second method requires a liquid density chart, a weighing machine, and an empty container. Take the empty container and place it on the weighing machine, note the reading from the machine. Pour the liquid into the container and then weigh the full container. To find the mass of liquid, you subtract the mass of the empty container from the full container. It will give you the mass. Then you have to refer to the density chart and find the density of the subject. The density formula is given by; density=mass/volume You place the density and the mass into this formula while making volume the subject. It will give you the volume of the liquid. These worksheets and lessons show students how to measure liquids properly and the units that are involved in those measures.

### Printable Worksheets And Lessons  #### Homework Sheets

• Homework 1 - Jug A has 38 ml of liquid and in Jug B has 54 ml of liquid. Answer A = 38 ml B = 54 ml
• Homework 2 - As we can see that in Red Glass 50 ml liquid and in Blue Glass 34 ml liquid.
• Homework 3 - The Blue Jar has 25 ml of liquid and in Yellow Jar you will find 38 ml of liquid.

#### Practice Worksheets

It is basically a vertical ruler for you to work with.

• Practice 1 - Read both of these cups. Determine what each line (increment means). These units are in milliliters (ml).
• Practice 2 - Read both of these rising glasses. Determine what each line (increment means). These units are all in milliliters (ml).
• Practice 3 - We have flasks here which you will commonly use in lab situations. See how much is in each of the flasks.

#### Math Skill Quizzes

I used gray flasks here. They seem to print very well with ink jet printers.

• Quiz 1 - You want to be eye level to read these properly. There is a set guide overlayed on each of the flasks.
• Quiz 2 - These may look like soda bottles, but we assure you this valid lab equipment.
• Quiz 3 - The old graduated cylinder. A standard measure for you to determine.

### The Common Tools for Taking These Measures in The Science Classroom

Being familiar with the tools that are used can help you better understand the accuracy of your measures. We focus a good deal of time on reading beakers and flasks over the series of worksheets found above. These are course measurement tools meaning they have a degree of inaccuracy associated with them. This would mean these tools are used for general measures when accuracy is not a huge concern. Standard beakers and flasks are accurate within five percent. This means that if you were to measure 100 mls in these tools, the actual measure would reside between 95-105 mls. This inaccuracy is created because the markings are stretched out. Volumetric flasks are much more accurate (within five hundredths of a percent) because their markings are more consistent. Smaller graduated cylinders have improved levels of precision (within one percent). You will also find that glass is much more consistent than plastic which results in a greater level of precision. When you need a higher level of accuracy, you would use a buret which is a long cylindrical tube and read much like a standard cylinder. For the utmost level of exactitude pipets which I refer to as scientific eye droppers will give you the highest level of confidence in your measures.