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Adhesion to the test tube or cohesion of the liquid molecules causes the meniscus to form.
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What is the scientific name for the curved water surface above the rim of a glass?
The curve you see on top of a liquid in a cylinder is called the meniscus and is due to the difference between the attractive force between the liquid molecules themselves and between the liquid molecules and the wall of the cylinder, as well as capillary action. When the molecules of the liquid have a greater attraction to the cylinder wall than to themselves, the meniscus is concave and the surface of the liquid curved downwards. Water drawn up a narrow glass cylinder has a concave meniscus. When the molecules of the liquid have a greater attraction to themselves than to the cylinder wall, the meniscus is convex and curves upwards. Mercury in a glass thermometer or barometer has a convex meniscus.
How can you relate volume to a meniscus?
When measuring the volume of a liquid in a graduated cylinder, you read it at eye-level and at the bottom of the curve of the meniscus. This is true for water and aqueous solutions. Some "non-water" liquids do not form a meniscus in a glass cylinder. Also, water does not form a meniscus in a plastic cylinder.
Is the curve at a liquids surface by which you measure the volume of a liquid?
The meniscus is the curve at a liquid's surface by which one measures the volume of the liquid. A meniscus can be concave or convex depending on whether it is attracted to itself or the glass.
How do you read meniscus on a graduated cylinder?
All liquids have a surface tension. This tension creates a meniscus or curve on the surface, most noticeable in small diameter tubes or cylinders. The meniscus of water curves up the sides of the cylinder, while heavy liquids like mercury curves down the cylinder. You should always measure light liquids at the bottom of the meniscus and heavy liquids at the top of the meniscus.
What is a meniscus is and how it is used to measure liquids?
A meniscus is the curve of a liquid. Like when you are filling a glass of water, if you continue to put water in the glass after it has reached the top, then the extra water will go above the glass in a curved shape. When you are measuring liquids in for example a graduated cylinder, you would take the measurement from the bottom of the meniscus. I hope this helps!
What liquid's meniscus curve up?
Water's meniscus curves up. Mercury's meniscus curves down.
What is a substance whose meniscus would curve downward?
Mercury's meniscus curves down. Water's meniscus curves up.
Why does water have a meniscus which curves upwards?
The Water molecules have a higher adhesion than cohesion. The would rather stick to the walls of the container than to itself.
What is the curve at a liquid surface?
The meniscus, which is creaded by adhesion of the liquid particles to the surface of the container. Water meniscus domes upwards - the water has greater bonding to its own molecules; Mercury meniscus domes downwards.
Why doesn't soapy water bulge from the sides of a glass?
Water, as other liquids, has "surface tension" which tries to pull the water into the smallest volume. When put into a glass the surface of the water behaves as if it has a skin. However, that part around the circumference of the glass where the water touches the glass tries to climb the glass, so creating a "meniscus". If you add soap to water its surface tension is greatly reduced so it is less able to form a curved upwards meniscus where it meets the glass.
What is the scientific name for the curved water surface above the rim of a glass?
The curve you see on top of a liquid in a cylinder is called the meniscus and is due to the difference between the attractive force between the liquid molecules themselves and between the liquid molecules and the wall of the cylinder, as well as capillary action. When the molecules of the liquid have a greater attraction to the cylinder wall than to themselves, the meniscus is concave and the surface of the liquid curved downwards. Water drawn up a narrow glass cylinder has a concave meniscus. When the molecules of the liquid have a greater attraction to themselves than to the cylinder wall, the meniscus is convex and curves upwards. Mercury in a glass thermometer or barometer has a convex meniscus.
What is the meniscus line?
A meniscus line is the little line that you have at the top of a liquid. If you fill a glass up with water, the line that seems to sit at the top of the water that you see when you look at the glass at eye level is the meniscus line.
When does the meniscus of a liquid in a glass tube curve downward?
A meniscus is caused by surface tension and It curves down (concave) when the liquid adheres to the container more than to itself, like water and glass. Mercury clings more to itself than glass, so it is curved up (convex)
Would a graduated cylinder be read at the middle of a meniscus?
The answer depends on the liquid, or more specifically, how the surface tension in the liquid affects the meniscus. It should be the top of the meniscus for liquids such as mercury but the bottom for liquids such as water or alcohol.
What forces create the meniscus you see at the top of a liquid when you measure it?
The meniscus is created by adhesive forces between the glass and the water. THis means that the water water molecules are attracted to the glass so they can creep up the glass to a small degree. The water molecules are also attracted to each other through hydrogen bonding. These are called cohesive forces and they allows the water that creeps up the glass to bring other water molecules with them. The cohesive forces and adhesive forces can only resist gravity to a certain degree so in the middle the liquid curves downward.
Why when placed in a glass tube water touching the glass is pulled slightly upward?
Meniscus. Essentially it is because water adheres to the glass.
Why does water form a meniscus when it is put into a glass beaker?
Water in a graduated cylinder form a meniscus due to attraction between the water molecules and the glass and the water being repelled by the container. If it is repelled a convex meniscus will be formed and if attracted it will result of a concave meniscus.
