The former investigates essentially general properties, such as the weight and density, the relation between pressure, volume and temperature (piezometric and thermometric properties), calorimetric properties, diffusion, viscosity, electrical and thermal conductivity, &c., and generally properties independent of composition.
The calorimetric data are generally the most deficient and difficult to secure.
This method is the most generally convenient and most readily applicable of calorimetric methods, but it is not always the most accurate, for various reasons.
Analogous difficulties arise in the application of other calorimetric methods.
A is the calorimetric tube, B the air-jacket and L the gauge.