Scale Reading - Chemistry

Scale Reading GRADE 9 CHEMISTRY

What is the volume of the liquid shown?

What is the temperatur e shown?

How to use a Measuring Cylinder to take Measurements 

Use a measuring cylinder that is large enough to hold the liquid being measured.

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Ensure that it is clean and dry. Unwanted particles or drops of liquid in the cylinder could throw off the measurement.

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After pouring the liquid in the measuring cylinder, place it on a flat surface and ensure that your eyes are at eye level to take reading.

How to use a Measuring Cylinder to take Measurements 

Take the liquid measurement at the very bottom of the dip in the surface of the liquid. This dip is called the meniscus; it forms because liquid molecules are more attracted to the glass than they are to each other.

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Look at the horizontal lines on the side of the cylinder. Ascertain to which line the meniscus is closest.

How to use a Measuring Cylinder to take Measurements 

Determine the increments of measurement on the tube. For example, if the area between the 40ml mark and the 50ml mark is divided into ten segments, each segment represents 1ml.

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Locate the closest whole measurement below the surface of the liquid.

How to use a Measuring Cylinder to take Measurements

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Count the number of segments up to the line nearest the meniscus. Calculate the volume of the liquid by adding the whole measurement to the sum of the segments. For example, 40.6ml.

How to Use a Thermometer to take Temperature Readings 

Hold the thermometer in the liquid being measured without the bulb of the thermometer touching the bottom of the container. This will ensure a more accurate reading.

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Look on the scale of the thermometer and determine where the meniscus of the mercury is.

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Read the scale from eye level and make note of the measurements.