why use a volumetric pipette instead of a graduated cylinder?
152684
They are inaccurate because of the large meniscus. Graduated Cylinders: A graduated cylinder is a quick and easy (though less accurate) way to measure the volume of a liquid. ... Volumetric pipets are so accurate because the long neck decreases the error in measuring volume of the meniscus.
542363
['Air displacement micropipettes.', 'Positive displacement pipette.', 'Volumetric pipettes.', 'Graduated pipettes.', 'Pasteur pipette.', 'Transfer pipettes.', 'Pipetting syringe.', 'Van Slyke pipette.']
1338513
However, a little back pressure is a good thing. In fact, it helps. The right size pipe is large enough to breathe well but small enough to create a high exhaust flow. Steps in the exhaust system also create negative pressure waves that travel back to the cylinder and help empty the cylinder of those gases.
1050850
In fact, you'll find with an unvented cylinder, your heating and hot water will run so smoothly that you won't even have to think about it. The only real downside to the unvented cylinder option is the price, which is significantly more expensive than a storage combi.
316997
 Hold the pipettor vertically and immerse the tip in the liquid. Release the push-button slowly and smoothly (to top position) to aspirate the set volume of liquid. Wait one second; then withdraw the pipette tip from the liquid.
1390207
The main advantage of the spherical construction is that the stress concentration in a spherical shape will be minimal while storing pressurized LPG. The stress resistance will be uniform. ... Area:Volume ratio --- The area that a sphere occupies will be lesser compared to a cylindrical container of the same volume.
208946
The two valves per cylinder allows for the same power with a smaller displacement. That same 12L with 24 valves could push more air in faster, so would have more horsepower per stroke, but the downside is the valves get to be smaller (and hotter) too.
58061
It offers small fluid resistance as the inner media channel of the body is straight. It flows though the valve which does not hampers the direction of the flow. It is an energy-efficient alternative as it consumes less power while opening or closing.
429073
Finally, calculate accuracy by using the equation A = 100 x Vavg/V0, where A is the accuracy of the pipette, Vavg is the average calculated volume and V0 is the theoretical volume you tried to dispense. If the accuracy value lies in the 99-101% range, the pipette is considered normal and calibrated.
166044
I would agree that a flat top piston would be stronger but if you get a good name part you should never have a problem with a dish piston. 16040747 part number 3 bar map is what I used, works real well and its cheap. Flat top is a better imo but you will need to run larg chamber heads.
880384
Answer and Explanation: There are many instruments that scientists use to measure specific volumes, including a graduated cylinder, buret, or pipette. When measuring volume,...
1392845
Instead, the volume of the rod equals the amount that the water went up in the graduated cylinder (the amount displaced). To find the amount of water displaced, students should subtract the initial level of the water (60 mL) from the final level of the water.
609765
But this comes with a bit of a weight penalty versus a flat-top piston, so the dished piston is more suitable for large-displacement, low-rpm engines. All of this makes the flat-top piston preferable for most performance engines, particularly those that don't use hemispherical combustion chambers.
993080
Place the graduated cylinder on a flat surface and view the height of the liquid in the cylinder with your eyes directly level with the liquid. The liquid will tend to curve downward. This curve is called the meniscus. Always read the measurement at the bottom of the meniscus.
1412403
A 250 cm3 volumetric flask has a maximum error of 0.2 cm3 0.2 ÷ 250 = 0.0008 0.0008 x 100 = 0.08%. Pipette (Class B) A 25 cm3 pipette has a maximum error of 0.06 cm3 0.06 ÷ 25 = 0.0024 0.0024 x 100 = 0.24%.
765758
Volumetric pipets are so accurate because the long neck decreases the error in measuring volume of the meniscus. They are only designed to measure one specific volume and commonly come in sizes 5 mL, 10 mL, 25 mL, and 50 mL. ... The pipet is read by placing the bottom of the meniscus on the measuring line.
1394219
The equal length header is a much more efficient design for a couple of reasons, but it all stems from the exhaust runners being the same length. ... This comes also with a normalization of exhaust pressure (backpressure) at each exhaust port which improves engine volumetric efficiency and top-end power.