Polyhydroxyaldehyde joke

Rock sugar melts quickly in hot water.

The higher the temperature, the stronger the molecular thermal movement, which makes the rock sugar soften and dissolve rapidly, which is also related to the properties of rock sugar itself. Rock sugar is a kind of polyhydroxy aldehyde, and it is an organic substance that can be dissolved in water. In this case, the higher the temperature, the greater the solubility.

Molecular thermal motion means that all objects are made up of molecules, atoms and ions (water is made up of molecules, iron is made up of atoms and salt is made up of ions), and the molecules of all substances are constantly moving and irregularly moving. The thermal motion of molecules is related to the temperature of the object (thermal motion can also be done at 0℃, and internal energy is based on thermal motion). The higher the temperature of an object, the faster the molecules move.

Diffusion phenomenon:

Different substances can enter each other, and physics calls this phenomenon diffusion.

Diffusion is not caused by external effects (such as convection, gravity, etc.). ) is not the result of chemical reaction, but is caused by the irregular movement of substance molecules. For example, a gold nugget and a lead nugget are pressed together. No matter whether the gold nugget is placed on top or below, gold will diffuse into lead, and lead will also diffuse into gold. Diffusion motion is the proof that matter molecules do random motion endlessly.

Diffusion has many applications in science and technology. In the production of semiconductor devices, other elements need to be doped into pure semiconductor materials, which is accomplished by molecular diffusion at high temperature.