1.   A shift in the weather pattern, bringing low pressure systems across the Alps in December laid down a firm base.

2.   Air is drawn in to this low pressure area primarily through the ventilation slots and also through the floppy disk drive apertures.

3.   At low pressures, a plasma is established with a discharge of positive ions travelling towards the cathode.

4.   This low pressure made a partial vacuum above the liquid.

5.   Winds in the northern hemisphere circulate anti-clockwise around low pressure.

6.   For low pressures, the torr is often used.

7.   The left-hand graph shows that at low pressure the volume of a fixed amount of gas is high.

8.   Real gases obey the ideal gas equation closely at low pressures and higher temperatures.