from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A material that insulates, especially a nonconductor of sound, heat, or electricity.
- n. A device that insulates.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A substance that does not transmit heat (thermal insulator), sound (acoustic insulator) or electricity (electrical insulator).
- n. A non-conductive structure, coating or device that does not transmit sound, heat or electricity (see image)
from the GNU version of the Collaborative International Dictionary of English
- n. One who, or that which, insulates.
- n. A substance or object that insulates; a nonconductor.
from The Century Dictionary and Cyclopedia
- n. One who or that which insulates; specifically, a substance or body that interrupts the communication of electricity or heat to surrounding objects; a non-conductor; anything through which an electric current will not pass.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a material such as glass or porcelain with negligible electrical or thermal conductivity
A measure of whether a semiconductor most resembles a conductor or an insulator is given in the band gap - the amount of energy needed to produce moving charge-bearers in the form of electrons and "holes".
This forms an insulator which is not affected by heat or moisture.
Although I am sure it would be hard for her to get brain freeze as air is an awesome insulator!
And the crowning glory, the "green" sedum roof – actually more of a russet colour – on the Newton building, which acts as a natural insulator, helps prevents flash flooding and provides a haven for birds, bees and butterflies.
Durring ice fishing I put a small minnow or smelt about 6-10 inches below the ice and cover the hole with a insulator on the tip up.
Glass is a very poor insulator (R-0. 24 per inch), which is why houses with single-pane windows lose so much heat.
(In reality, the sheet might do better than the extra glass because it traps air underneath — also a better insulator than glass!)
The material is also an excellent insulator, and is flexible, making it appropriate in areas at risk of earthquakes.
Besides serving as a coolant and insulator, mineral oil, a byproduct of petroleum distillation, has many other uses, including as a laxative.
I had always heard that snow was a good insulator and thus protected the animals and the plants on or in the soil against very low temperatures.