Samples of air from the spacecraft are examined both before and after flight for gas concentrations.

Just picking up a telephone receiver can cause electrical activity that, if the gas concentration is high enough, could lead to disaster.

This change in resistance is used to calculate the gas concentration.

Also, there is a strong correlation between rising gas concentrations and regions where industrial activity has been strongest.

Every increase in gas concentration results in a pronounced "leak peak".

Any sharp increase in key gas concentration is indicative of a potential problem within the transformer.

But radon escaping into a house from water use usually makes up only a small fraction of the overall gas concentration indoors, it said.

He formulated a simple mathematical relationship between the gas concentration and the necessary exposure time.

In many applications, however, the gas concentration is known and other parameters are in focus.

Figures 6show the corresponding fits for the alveolar gas concentration.