Substances can be solids and liquids or gases. These are the different states of matter. Substances move from one state to another when they are heated or cooled, boosted or reducing the energy of their particles. So, let’s learn about solids and liquids first.
1. What are Solids?
In Solids, particles are locked together, so solids have a definite shape and volume. In contrast, liquids, particles move around a bit, so liquids can flow into any shape, while their volume stays the same. However, in gases, particles zoom about all over the place, so gases spread out to fill containers of any size or shape.
2. What is snow?
Snow is compressed of small ice particles which are formed when water droplets in a cloud get so cold they freeze. The ice particles start to stick together, forming snowflakes. Once the flakes are heavy enough, they fall.
3. What substance has the highest melting point?
The metal with the highest melting point is tungsten which melts at 3414° C. But the highest known melting point of any substance belongs to Carbon, which melts at 3825° C.
4. Which substance has the Lowest Freezing point ?
Mercury has the lowest freezing point of any metal, at -38.83° C. Helium has the lowest freezing point of all substances, at -268.9° C, which is less than 4° above absolute zero.
5. When do things freeze?
Things freeze from liquid to solid when they reach the freezing point. Most substances get smaller when they freeze as the particles pack closer together. But water gets bigger as it turns to ice.
6. When do things melt?
Things melt from solid to liquid on reaching a temperature called the melting point. Each substance has its own melting. Water’s is 0° C; lead is 327.5° C.