YosemiteSam
Unfriendly and Aloof!
- Messages
- 45,858
- Reaction score
- 22,194
For those that how sure how big a micrometer is, it's 1 millionth of a meter. Or in the Standard System of measurement, divide an inch 1 thousand times.
Basically it's smaller than the diameter of a single strand of hair.
===========================================
German physicists say they've built a heat engine measuring only a few micrometers across which works as well as a normal-sized version - although it sputters, they admit.
Researchers at the University of Stuttgart and the Max Planck Institute for Intelligent Systems say that the engine does basically work, meaning there's nothing, in principle, to prevent the construction of highly efficient, small heat engines.
"We've developed the world's smallest steam engine, or to be more precise the smallest Stirling engine, and found that the machine really does perform work," says Clemens Bechinger of the University of Stuttgart.
"This was not necessarily to be expected, because the machine is so small that its motion is hindered by microscopic processes which are of no consequence in the macroworld." The disturbances cause the micromachine to run rough and sputter.
The researchers couldn't construct the tiny engine in the same way as a normal-sized one. In the heat engine invented almost 200 years ago by Robert Stirling, a gas-filled cylinder is periodically heated and cooled so that the gas expands and contracts. This makes a piston execute a motion with which it can drive a wheel, for example.
Complete Story
Basically it's smaller than the diameter of a single strand of hair.
===========================================
German physicists say they've built a heat engine measuring only a few micrometers across which works as well as a normal-sized version - although it sputters, they admit.
Researchers at the University of Stuttgart and the Max Planck Institute for Intelligent Systems say that the engine does basically work, meaning there's nothing, in principle, to prevent the construction of highly efficient, small heat engines.
"We've developed the world's smallest steam engine, or to be more precise the smallest Stirling engine, and found that the machine really does perform work," says Clemens Bechinger of the University of Stuttgart.
"This was not necessarily to be expected, because the machine is so small that its motion is hindered by microscopic processes which are of no consequence in the macroworld." The disturbances cause the micromachine to run rough and sputter.
The researchers couldn't construct the tiny engine in the same way as a normal-sized one. In the heat engine invented almost 200 years ago by Robert Stirling, a gas-filled cylinder is periodically heated and cooled so that the gas expands and contracts. This makes a piston execute a motion with which it can drive a wheel, for example.
Complete Story