Thermal Conductivity Vacuum Gauge.

热传导真空计。

Thermal conductivity varies for different gases.

热传导率因不同气体而异。

The problem is the low thermal conductivity of air.

问题在于空气的热导率很低。

Thermal conductivity increases with the decrease of temperature.

随着温度的下降导热系数反而增大。

So it has low electrical conductivity and low thermal conductivity.

所以它的导电率比较低，并且导热率也非常低。