In preferred embodiments, the exhaust flow regulating apparatus (44) is either a fixed cross-sectional area orifice or a variable cross-sectional area orifice.

A cross-sectional surface of the electrochemical cell (10) is thereby adapted to the cross-sectional surface of the accommodation compartment.

A cross-sectional area of the at least one nozzle in the inner main surface exceeds a cross-sectional area of the at least one nozzle in the outer main surface.

The tube (12) has a cross-sectional area of under 1 mm2.

The stick has a same cross-section area along its length that is equal to or less than the cross-section area of the grating.

The contact chamber has a cross sectional area that is greater than the cross sectional area of the entry passage.

The tip has a transverse, cross-sectional area larger than the smallest transverse cross-sectional area of the tapered portion of the core wire.

The tapered portion has a transverse, cross-sectional area which generally decreases distally.

The expansion of the core increases a cross- sectional area of the passages at the periphery of the core.

A cross- sectional area of the outlet port and the side outlet ports together is equal or greater than a cross-sectional area of the inlet port.

The output end comprises an orifice (47) having a cross-sectional area of less than about 60 mm2.

The second connection strips have a larger total cross-sectional area in the direction of electrical currents.

The chamber has one or more fields that are each defined by a cross - sectional area.

The electric insulated wire can reduce the high frequency loss in comparison with a single wire having the same sectional area, and can decrease the outer diameter thereof in comparison with a litz wire having the same sectional area.

Said large-cross-sectional-area sections (113A) between the electrodes (211A, 211B) can thus be heated.