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Effectus [21]
3 years ago
10

Tooth fillings are often made of gold or porcelain because these materials are ______.

Physics
2 answers:
garri49 [273]3 years ago
4 0
Tooth fillings are often made of gold or porcelain because these materials are nonreactive.

b. nonreactive.
damaskus [11]3 years ago
3 0

Tooth fillings are often made of gold or porcelain because these materials are:

b. nonreactive

That means that they don't corrode or rust and they are resistible to staining.Their thermal conductibility is low.

Explanation:

Porcelain-fused-to-metal crowns. PFM crowns are an approximately esthetic improvement that has been in use for more than 40 years. In one way, they blend the best of both worlds, a crown made of “refined or noble” metal (gold or platinum), which is strong, fits correctly and is bonded/bonded to the tooth.

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"Q = ΔU + W" is the equation is used to solve the questions related to "First law of thermodynamics".

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"First law of thermodynamics" states that "energy" neither created nor destroyed, but it can transfer from "one form of energy" to "another form of energy".

This "First law of thermodynamics" is also called as "law of conversation of energy". The formula for "First law of thermodynamics" of a system is that "change in internal energy of a system" is same as the difference of "heat energy" flows across the " boundaries of a system" and the "work done" on the system.

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