| New research results show that almost invisible, airborne fine particles smaller than 2.5 thousandths of a millimetre are a major health risk. |
| For example, photo cells monitor the precision of ballpoint pen tips, which are manufactured to tolerances of two thousandths of a millimetre. |
| The hard disk operates in milliseconds, or thousandths of a second, because it is mechanical. |
| In the short track speed skating, for example, where margins were often just a few thousandths of a second. |
| The current is of such high frequency that it flows along the metal surface to a depth of several thousandths of an inch. |
| The airbags inflate in 30 thousandths of a second to supplement the action of the safety belt during the final phase of impact deadening. |
