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You should always measure at the lowest part of the meniscus. The meniscus is a slight curvature at the top of a liquid in a container.
DiFFERENTIAL PRESSURE LEVEL DETECTOR
When a liquid is held in a vessel, the water adheres to the side of the vessel. So when the amount of liquid held by the vessel is less than the full amount the vessel will hold, the liquid level rises where it touches the vessel. It "sticks" to the side of the vessel hard enough to be above the top of the liquid. This is called a negative meniscus. When the level of the liquid is higher than the top of the vessel (but doesn't overflow the top due to the surface tension of the liquid), then there is a positive meniscus.
Let the liquid out of the first pipe (with the 3) turn right, and then up through the horizontal pipe.
1. Look at the liquid at eye level 2. Measure from the meniscus (the curved line at the surface of the liquid) 3. Be sure to measure your intervals (the value of each measurement line on the cylinder)
The bottom of the meniscus should be halfway between the 5.1-mL mark and the 5.2-mL mark
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There are many types of pipettes (or pipet), but most are essentially a fancier version of a medicine dropper or eye dropper. They are used in a laboratory to transport and/or measure a specific volume of liquid.Volumetric pipettes allow the user to measure a volume of solution extremely accurately and then add it so something else. They are commonly used to make laboratory solutions from a base stock as well as prepare solutions for titration. They typically only allow you measure one single volume in a particular size pipette (just like with volumetric flasks). Therefore, they come in many different sizes.There are other types of pipettes also, such as a Pasteur pipette, which is not used to measure the volume of the liquid. It is essentially a large dropper, which can be used to remove liquid from one container and add it to another.There are also graduated pipettes, also called a Mohr pipette, which also allow you to measure the volume of the liquid in the pipette, although not as accurately as a volumetric pipette. These use a series of marked lines (as on a graduate cylinder) to indicate the different volumes. These also come in a variety of sizes. These are used much like a burette, in that the volume is found by calculating the difference of the liquid level before and after.All glass pipettes require the use of some kind of additional suction device, typically a pipette bulb (not the Eppendorf pipette or other similar ones, which have a built-in suction mechanism), which is a rubber bulb which sucks the liquid into the pipette and also allows you to drain the pipette in a controlled fashion. A Beral pipette is a one-piece pipette, usually made from flexible soft plastic (polyethylene) that has a built-in bulb on the end.See the Related Questions and Web Links to the left for pictures and more information on pipets and other laboratory equipment.*A piece of laboratory glassware, shaped like a thin tube with a bulge in the middle, that allows better accuracy when measuring certain volumes (hence the range of sizes) e.g. when making solutions or samples for titrations.Function of a pipette: to deliver small and exact volumes of liquids; extremely useful in chemical laboratories.
Put some liquid in the measuring cylinder - to a height that is greater than the height of the pebble. Measure the level of the liquid. Then add the pebble into the cylinder and measure the level of the liquid again. the difference between the two levels is the volume of the pebble,Put some liquid in the measuring cylinder - to a height that is greater than the height of the pebble. Measure the level of the liquid. Then add the pebble into the cylinder and measure the level of the liquid again. the difference between the two levels is the volume of the pebble,Put some liquid in the measuring cylinder - to a height that is greater than the height of the pebble. Measure the level of the liquid. Then add the pebble into the cylinder and measure the level of the liquid again. the difference between the two levels is the volume of the pebble,Put some liquid in the measuring cylinder - to a height that is greater than the height of the pebble. Measure the level of the liquid. Then add the pebble into the cylinder and measure the level of the liquid again. the difference between the two levels is the volume of the pebble,
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Immerse it in a liquid, and measure how much the level of the liquid rises.
You should always measure at the lowest part of the meniscus. The meniscus is a slight curvature at the top of a liquid in a container.
DiFFERENTIAL PRESSURE LEVEL DETECTOR
Because you use a spirit (alcohol) or other liquid with a bubble in it to level out whatever you measure.
When a liquid is held in a vessel, the water adheres to the side of the vessel. So when the amount of liquid held by the vessel is less than the full amount the vessel will hold, the liquid level rises where it touches the vessel. It "sticks" to the side of the vessel hard enough to be above the top of the liquid. This is called a negative meniscus. When the level of the liquid is higher than the top of the vessel (but doesn't overflow the top due to the surface tension of the liquid), then there is a positive meniscus.
When measuring volumes you should always measure from the bottom of the meniscus - the surface of a volume of liquid always has a slight curve called the 'meniscus'. Since the surface of any still volume of water is not flat (it is always either a convex or concave curve), it should be measured on a level surface at eye level - bend your knees until your eyes are level with the miniscus to measure accurately.