Process Control and Instrumentation
Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by

Making the volume of thermometer bulb as large as conveniently possible
All of these
Reducing the volume of the capillary to a minimum
Reducing the volume of the receiving element to a minimum

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Process Control and Instrumentation
Routh test

Can not determine as to how many roots of the characteristics equation have positive real roots
Cannot be used to test the stability of a control system containing transportation lag
Criterion is not applicable to systems with polynomial characteristic equation
Criterion provides information about the actual location of roots

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