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— A device consisting of a series of grooves, fins, etc. machined into or fitted onto a shaft, a piston, a packing piece, etc. for preventing leakage of a fluid.

— Conditions of a mixture when the constituents separate out.

— The condition when the quantity of refrigerant in a refrigerating circuit is below the minimum to ensure the correct feed to the evaporator.

— In physiology, that time elapsing between a stimulus and the response to the stimulus.

— The time interval between a change in the input variable and the initiation of the corresponding change in the output variable.

— Unwanted crack or porosity in the constructional material of an apparatus of such dimensions that while it is impermeable to He I or to gaseous He it lets helium through below the lambda point.

— The locus of the He I - He II transition temperature as a function of pressure from the vapour pressure (2.18 K, 5200 Pa = 39 torr) to the melting pressure (1.75 K, 3 MPa = 30 atm).

— The temperature (2.18 K) characterized by a lambda-shaped peaked anomaly of the specific heat, at which liquid helium passes into the superfluid state (He I - He II transition) at the vapour pressure.

— Fluid flow in which all the particles move in substantially parallel paths.

— A leak tight material made by sticking several thicknesses of paper together.