Diameter
noun
The distance or line through the center of something from one side to the other.
The diameter of the circle is 10 centimeters.
Often appears as...
- circle diameter
- tube diameter
noun
In mathematics, a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.
The diameter of this cylinder is greater than the radius.
Often appears as...
- cylinder diameter
- sphere diameter
Usage tips
Academic
noun
In optics, a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of its focal length measured in meters.
The lens has a diameter of 50 millimeters.
Often appears as...
- lens diameter
- mirror diameter
Usage tips
Technical
noun
In graph theory, the longest shortest path between any two vertices in a graph.
The diameter of this binary tree is 4.
Often appears as...
- tree diameter
- graph diameter
Usage tips
Technical
noun
The distance or line through the center of something from one side to the other.
The diameter of the circle is 10 centimeters.
Often appears as...
- circle diameter
- tube diameter
noun
In mathematics, a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.
The diameter of this cylinder is greater than the radius.
Often appears as...
- cylinder diameter
- sphere diameter
Usage tips
Academic
noun
In optics, a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of its focal length measured in meters.
The lens has a diameter of 50 millimeters.
Often appears as...
- lens diameter
- mirror diameter
Usage tips
Technical
noun
In graph theory, the longest shortest path between any two vertices in a graph.
The diameter of this binary tree is 4.
Often appears as...
- tree diameter
- graph diameter
Usage tips
Technical
Definition 1 of 4
Pro Tip 1/3Visualize Measurement
Imagine cutting through an object's center; 'diameter' is that end-to-end line.
Picture a pizza; its diameter runs from crust to crust through the middle.
Pro Tip 2/3Not Just Circles
'Diameter' can describe the width of various objects, not only perfect circles.
The diameter of this round table is 1.2 meters.
Pro Tip 3/3Two Times Radius
The diameter is always twice the length of the radius.
If the radius is 5 cm, the diameter is 10 cm.
Pro Tip 1/3Visualize Measurement
Imagine cutting through an object's center; 'diameter' is that end-to-end line.
Picture a pizza; its diameter runs from crust to crust through the middle.
Pro Tip 2/3Not Just Circles
'Diameter' can describe the width of various objects, not only perfect circles.
The diameter of this round table is 1.2 meters.
Pro Tip 3/3Two Times Radius
The diameter is always twice the length of the radius.
If the radius is 5 cm, the diameter is 10 cm.
Pro Tip 1/3Visualize Measurement
Imagine cutting through an object's center; 'diameter' is that end-to-end line.
Picture a pizza; its diameter runs from crust to crust through the middle.
Pro Tip 2/3Not Just Circles
'Diameter' can describe the width of various objects, not only perfect circles.
The diameter of this round table is 1.2 meters.
Pro Tip 3/3Two Times Radius
The diameter is always twice the length of the radius.
If the radius is 5 cm, the diameter is 10 cm.
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Video examples
Elon Musk: The future...
and if you go deep enough, you cannot detect the tunnel. Sometimes people think, well, it's going to be pretty annoying to have a tunnel dug under my house. Like, if that tunnel is dug more than about three or four tunnel diameters beneath your house, you will not be able to detect it being dug at all.
Video examples
What causes kidney...
But most kidney stones don't become this serious, or even require invasive treatment. Masses less than five millimeters in diameter will usually pass out of the body on their own. A doctor will often simply recommend drinking large amounts of water to help speed the process along,
Video examples
Why Are Plankton the...
being a thousandth of a millimetre that's smaller than the diameter of a human hair now while plankton may appear to be aimless drifters directionless in their movements in life they play a key role and perhaps the most vital organism on earth you see each and every plankton
Video examples
Beyond the edge of the...
on earth we look at these hot springs on the seafloor giant tubeworms the iconic animals the blood red plumes really very beautiful in life they get eaten by other things these two worms are called it can be as big as me and it can be about you know an inch or so in diameter
Video examples
Robots that fly ... and...
the robot naturally becomes agile. So here, R is the characteristic length of the robot. It's actually half the diameter. And there are lots of physical parameters that change as you reduce R. The one that's most important is the inertia, or the resistance to motion.
Video examples
Lifting a Man with...
when Tony said big balloons he meant big balloons at the size of those things our warp up and it's going to get bigger when this balloon is fully inflated it'll have a diameter of two and a half meters and it will hold over seven cubic
Video examples
What will humans look...
using light or other mechanisms directly to things like these prosthetics. And if you can do that, then you can begin changing fundamental aspects of humanity. So how quickly you react to something depends on the diameter of a nerve.
Video examples
One Man’s Mission to...
like these stumps that were giving up for dead like I was given up for dead surprise surprise they came back to life so we went and found the biggest stump right here we found groves of redwoods that are 30 foot plus in diameter it's
Video examples
Black Holes 101 PIPE...
and has a diameter about the distance between the earth and our sun. Because black holes are invisible, the only way for scientists to detect and study them is to observe their effect on nearby matter. This includes accretion disks,
Video examples
Who won the space race? ...
the world's first man-made satellite, into space. This little metal ball, smaller than two feet in diameter, launched a space race between the U.S. and U.S.S.R. that would last for eighteen years
Video examples
Elon Musk: The future...
and if you go deep enough, you cannot detect the tunnel. Sometimes people think, well, it's going to be pretty annoying to have a tunnel dug under my house. Like, if that tunnel is dug more than about three or four tunnel diameters beneath your house, you will not be able to detect it being dug at all.
Video examples
What causes kidney...
But most kidney stones don't become this serious, or even require invasive treatment. Masses less than five millimeters in diameter will usually pass out of the body on their own. A doctor will often simply recommend drinking large amounts of water to help speed the process along,
Video examples
Why Are Plankton the...
being a thousandth of a millimetre that's smaller than the diameter of a human hair now while plankton may appear to be aimless drifters directionless in their movements in life they play a key role and perhaps the most vital organism on earth you see each and every plankton
Video examples
Beyond the edge of the...
on earth we look at these hot springs on the seafloor giant tubeworms the iconic animals the blood red plumes really very beautiful in life they get eaten by other things these two worms are called it can be as big as me and it can be about you know an inch or so in diameter
Video examples
Robots that fly ... and...
the robot naturally becomes agile. So here, R is the characteristic length of the robot. It's actually half the diameter. And there are lots of physical parameters that change as you reduce R. The one that's most important is the inertia, or the resistance to motion.
Video examples
Lifting a Man with...
when Tony said big balloons he meant big balloons at the size of those things our warp up and it's going to get bigger when this balloon is fully inflated it'll have a diameter of two and a half meters and it will hold over seven cubic
Video examples
What will humans look...
using light or other mechanisms directly to things like these prosthetics. And if you can do that, then you can begin changing fundamental aspects of humanity. So how quickly you react to something depends on the diameter of a nerve.
Video examples
One Man’s Mission to...
like these stumps that were giving up for dead like I was given up for dead surprise surprise they came back to life so we went and found the biggest stump right here we found groves of redwoods that are 30 foot plus in diameter it's
Video examples
Black Holes 101 PIPE...
and has a diameter about the distance between the earth and our sun. Because black holes are invisible, the only way for scientists to detect and study them is to observe their effect on nearby matter. This includes accretion disks,
Video examples
Who won the space race? ...
the world's first man-made satellite, into space. This little metal ball, smaller than two feet in diameter, launched a space race between the U.S. and U.S.S.R. that would last for eighteen years
Example 1 of 10
Quote examples
Paul McEuen
American Physicist
Carbon nanotubes are amazing because they're really good electrical conductors, yet they are only a few atoms in diameter. You can make transistors out of them in the same way you can with silicon. At Berkeley, we made the narrowest device anybody had ever made. It was basically a single molecule.
Quote examples
Mary Roach
American Author
Chew on this: Human teeth can detect a grain of sand or grit 10 microns in diameter. A micron is 1/25,000 of an inch. If you shrank a Coke can until it was the diameter of a human hair, the letter O in the product name would be about 10 microns across.
Quote examples
Richard Preston
American Writer
An Ebola particle is only around eighty nanometres wide and a thousand nanometres long. If it were the size of a piece of spaghetti, then a human hair would be about twelve feet in diameter and would resemble the trunk of a giant redwood tree.
Quote examples
Joshua A. Norton
American Celebrity
Now, therefore, the Directors of the company are hereby ordered to see that precautions are taken to make travel on said railroad perfectly safe by using a screw with at least twenty-four inches diameter.
Quote examples
Lennart Nilsson
Swedish Photographer
There is a new way with very very tiny fiber optics, which give an enormous high resolution. There are many many thousand fibers, very very close together with a very small diameter.
Quote examples
William Henry Ashley
American Businessman
Many of their lodges remained as perfect as when occupied. They were made of poles two or three inches in diameter, set up in circular form, and covered with cedar bark.
Quote examples
Albert Claude
Belgian Scientist
Small bodies, about half a micron in diameter, and later referred to under the name of 'mitochondria' were detected under the light microscope as early as 1894.
Quote examples
Sarah Parcak
American Scientist
Satellite datasets like WorldView can see objects as small as 1.5 feet in diameter. In 2014, WorldView-3 will be able to see objects a small as a foot.
Quote examples
Samuel Johnson
English Writer
You teach your daughters the diameters of the planets and wonder when you are done that they do not delight in your company.
Quote examples
Mildred Dresselhaus
American Scientist
The holy grail would be to turn a knob, and out comes the nanotube of the right diameter and chirality.
Quote examples
Paul McEuen
American Physicist
Carbon nanotubes are amazing because they're really good electrical conductors, yet they are only a few atoms in diameter. You can make transistors out of them in the same way you can with silicon. At Berkeley, we made the narrowest device anybody had ever made. It was basically a single molecule.
Quote examples
Mary Roach
American Author
Chew on this: Human teeth can detect a grain of sand or grit 10 microns in diameter. A micron is 1/25,000 of an inch. If you shrank a Coke can until it was the diameter of a human hair, the letter O in the product name would be about 10 microns across.
Quote examples
Richard Preston
American Writer
An Ebola particle is only around eighty nanometres wide and a thousand nanometres long. If it were the size of a piece of spaghetti, then a human hair would be about twelve feet in diameter and would resemble the trunk of a giant redwood tree.
Quote examples
Joshua A. Norton
American Celebrity
Now, therefore, the Directors of the company are hereby ordered to see that precautions are taken to make travel on said railroad perfectly safe by using a screw with at least twenty-four inches diameter.
Quote examples
Lennart Nilsson
Swedish Photographer
There is a new way with very very tiny fiber optics, which give an enormous high resolution. There are many many thousand fibers, very very close together with a very small diameter.
Quote examples
William Henry Ashley
American Businessman
Many of their lodges remained as perfect as when occupied. They were made of poles two or three inches in diameter, set up in circular form, and covered with cedar bark.
Quote examples
Albert Claude
Belgian Scientist
Small bodies, about half a micron in diameter, and later referred to under the name of 'mitochondria' were detected under the light microscope as early as 1894.
Quote examples
Sarah Parcak
American Scientist
Satellite datasets like WorldView can see objects as small as 1.5 feet in diameter. In 2014, WorldView-3 will be able to see objects a small as a foot.
Quote examples
Samuel Johnson
English Writer
You teach your daughters the diameters of the planets and wonder when you are done that they do not delight in your company.
Quote examples
Mildred Dresselhaus
American Scientist
The holy grail would be to turn a knob, and out comes the nanotube of the right diameter and chirality.
Example 1 of 10
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