Question

The gas filling in the packed
The highly resistive material using in the heating coils is made up of _
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Answer 1

Answer:

Nitrogen Gas

Explanation:

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Answer 2

Answer:

Nichrome: Most resistance wire heating elements use nichrome 80/20 (80% Nickel, 20% Chromium) wire, ribbon, or strip. Nichrome 80/20 is an ideal material, because it has relatively high resistance and forms an adherent layer of chromium oxide when it is heated for the first time.Nichrome Nichrome, a non-magnetic 80/20 alloy of nickel and chromium, is the most common resistance wire for heating purposes because it has a high resistivity and resistance to oxidation at high temperatures. When used as a heating element, it is usually wound into coils.

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