What Is an Ostwald Viscometer?

The Viscometer was designed by W. Ostwald. It is a U-shaped glass tube with two bulbs, with a score A and B on the top and bottom of the I-bubble, and a capillary tube below it. In use, two different liquids of equal volume flow through the same capillary under the bubble, respectively. Due to the different viscosity coefficients of the two liquids, the flow time is different. When measuring, water is generally used as the standard liquid. First inject water into the bubble, then inhale it into the bubble, and make the water surface above the score A. Due to the effect of gravity, water flows into the bubble through the capillary. When the water surface drops from the nick A to the nick B, note the time t1 elapsed during it, and then change the same volume of liquid to be measured in the bubble. Measure the corresponding time t2 according to the formula

Austen Viscometer

The structure of the Viscometer is shown in the figure. The Viscometer is suitable for measuring the relative viscosity of low viscosity liquids.

The Viscometer was designed by W. Ostwald. It is a U-shaped glass tube with two bulbs. The I bubble has a score a and b on top and bottom, and a capillary tube is below it. In use, two different liquids of equal volume flow through the same capillary under the bubble, respectively. Due to the different viscosity coefficients of the two liquids, the flow time is different. When measuring, water is generally used as the standard liquid. First inject water into the bubble, and then suck it into the bubble, and make the water surface reach above the score a. Due to the effect of gravity, water flows into the II bubble through the capillary. When the water surface drops from the score a to the score b, note the time t1 elapsed between them, and then change the same volume of liquid to be measured in the II bubble, using the same method Measure the corresponding time t2 according to the formula

The Viscometer is easy to make, easy to operate, and has high measurement accuracy. It is especially suitable for the research of liquids with small viscosity coefficients, such as water, gasoline, alcohol, plasma or serum.

1. Wash the austenitic viscometer with lotion and distilled water first, then dry it for later use.

2. Then adjust the thermostat of the austenitic viscometer to (25.0 ± 0.1) ° C.

3. Take a certain amount of liquid to be measured with a pipette and place it in an Aussie viscometer, and then vertically fix the austenitic viscometer in a constant temperature bath for a constant temperature of 5 to 10 minutes.

4. After compressing the ear wash ball, connect a segment of rubber tube to 1 mouthpiece and inhale into the tube. After the liquid rises to 1cm on the A-line of one tube, unplug the ear wash ball. Use a stopwatch to measure the time required for the liquid to flow between the two AB scales. Repeat the same operation and measure 5 times. It is required that the time difference between each time does not exceed 0.3s, and the average value is taken.

5. Finally, pour the liquid to be measured in the austenitic viscometer into a recovery bottle and blow dry with hot air. Then use a pipette to take the same volume of distilled water from the 2 nozzles and place it in the viscometer. Same as in the previous step, measure the time required for the distilled water to flow between the two AB scales. Repeat the same operation.

Because the Viscometer is calibrated using the principle of gravity, the Viscometer is designed by W. Ostwald. It is a U-shaped glass tube with two bulbs, with a score A and B on the top and bottom of the I-bubble, and a capillary tube below it. In use, two different liquids of equal volume flow through the same capillary under the bubble, respectively. Due to the different viscosity coefficients of the two liquids, the flow time is different.

When measuring, water is generally used as the standard liquid. First inject water into the bubble, then inhale it into the bubble, and make the water surface above the score A. Due to the effect of gravity, water flows into the bubble through the capillary. When the water surface drops from the nick A to the nick B, note the time t1 elapsed during it, and then change the same volume of the test liquid in the bubble using the same method Measure the corresponding time t2 according to the formula

The Viscometer is easy to make, easy to operate, and has high measurement accuracy. It is especially suitable for the research of liquids with small viscosity coefficients, such as water, gasoline, alcohol, plasma or serum.