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• The ratio k/wc = α is defined as the thermal diffusivity.

• Sand and sandstone formations make excellent reservoirs.

• Electrometallurgy refers to recovery of a metal which is first obtained by ...

• Table 3 presents a list of ...

• The two following statements constitute the second law: ...

• Communication equipment comprises (or is, or represents) an essential item of nearly all space vehicles.

• An electric current consists in the flow of free electrons through ...

• Heating up to about 600°C constitutes a secondary hardening.

• Such atoms would constitute antimatter.

• Exact analysis of the situation described presents a difficult mathematical problem.

• The outer rim makes up one pole and the inner area is the opposite pole.