True gold is not afraid of fire(zhēn jīn bù pà huǒ)

true gold does not fear fire

The synonym "true gold is not afraid of fire" generally refers to "true gold is not afraid of fire". The right thing can stand the test. The words come from Chapter 115 of sunny day: "dark clouds can't cover the sun, true gold is not afraid of fire, dongshanwu will always be the sun in the sky, and will always be the world of our people!" Gao Xiaosheng's Jiang Kunda, a great man, said, "if Liu says he wants to investigate, you can go with him. Zhenjin is not afraid of fire. Check it out!"

Idiom information

It means that people with good quality and strong will can stand any test. The soldiers of the Chinese people's Liberation Army have gone through the test of blood and fire and become more brave. True gold is not afraid of fire, upright body is not afraid of shadow, not doing bad things, not afraid of ghosts knocking on the door. a strong willed man can stand the test and remain the same

Principles of Chemistry

True gold is not afraid of fire. It doesn't mean that fire doesn't melt gold, because the melting point of gold is really not high. But the chemical stability of gold is very high, it is not easy to react with other substances, and there is no need to worry about oxidation discoloration. Even in the molten state, it will not oxidize and discolor, and it will still glitter after cooling. At the same time, the volatilization of gold in molten state is also very little, which can be ignored. Therefore, even if the gold is burned, the gold nugget obtained after cooling is the same color and weight as the gold before burning, and there is no oxidation loss. however, although the melting point of copper, iron and other metals is higher than that of gold, their chemical stability is far less than that of gold. They will be oxidized at room temperature. Even if they do not reach the melting temperature, the degree of oxidation reaction at high temperature will be greatly increased. It must change color after cooling, and the weight of oxide removed is not as good as that before burning.

Historical allusions

In ancient times, a large family was caught in a fire, and the house was burnt out. There is nothing left at home, copper, iron, silver and other utensils, furniture and jewelry. In the ashes, only a lot of gold cakes were found. Later, the weight of gold cakes was the same as that of gold utensils and jewelry before. So at that time, people thought that everything else could be burned, but not gold. "Burning" here does not mean melting, but actually chemical change. Everything else has disappeared in the fire, only gold. Although it has changed its shape, it still glitters and its weight remains the same.

Chinese PinYin : zhēn jīn bù pà huǒ