Graduated cylinder facts for kids
A graduated cylinder is a special tool used in science labs. It helps scientists and students accurately measure the amount, or volume, of liquids. You might also hear it called a measuring cylinder.
These cylinders are super important for experiments. They make sure you use the exact right amount of a liquid. This is very important when mixing chemicals for a reaction.
Graduated cylinders can be made from different materials. Smaller ones are often made of glass. Larger ones are sometimes made from strong plastic, like polyethylene. Plastic cylinders are lighter and won't break as easily as glass. However, glass ones are sometimes easier to clean very thoroughly.
Contents
What is a Graduated Cylinder?
A graduated cylinder looks like a tall, narrow tube. It has markings along its side, like a ruler. These markings show different measurements of liquid volume. They help you read exactly how much liquid is inside.
Scientists use these tools all the time. They are essential for many types of experiments. They help ensure that results are correct and repeatable.
How to Measure Volume Accurately
When you measure liquid in a graduated cylinder, you'll notice the liquid's surface isn't perfectly flat. It curves a little bit. This curve is called the meniscus.
To get the most accurate reading, you need to look at the bottom of this curve. Make sure your eyes are level with the meniscus. This helps you avoid mistakes in your measurement. For example, if the bottom of the curve lines up with the 25 mL mark, then you have 25 milliliters of liquid.
Why Accuracy Matters
Measuring accurately is super important in science. If you use too much or too little of a liquid, your experiment might not work. Or, you might get the wrong results. Graduated cylinders help scientists be very precise. This precision leads to better discoveries and safer experiments.
Different Types of Graduated Cylinders
Graduated cylinders come in many sizes. You can find small ones that hold just a few milliliters (mL). There are also large ones that can hold hundreds or even thousands of milliliters. The size you use depends on how much liquid you need to measure.
Some cylinders have a spout at the top. This spout makes it easier to pour liquids out without spilling. Others might have a stopper, which is a lid to keep the liquid inside.
Materials Used
As mentioned, graduated cylinders are usually made of glass or plastic.
- Glass cylinders are often made from borosilicate glass. This type of glass is strong and can handle many chemicals. It's also easy to clean very well.
- Plastic cylinders are lighter and more durable. They are less likely to break if dropped. This makes them a good choice for busy labs or for younger students.
Images for kids
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A graduated Measuring Cylinder with a plastic Stopper
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If the reading is done and the value calculated is set to be 40.0 mL. The precise value would be 40.0 ± 0.1 or 40.1 to 39.9 mL
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If the reading is done and the value calculated is set to be 36.5 mL. The more precise value equates to 36.5 \pm 0.5 mL or 36.0 to 37.0 mL.
See also
In Spanish: Probeta (química) para niños
