What is the difference between sand and sand?

Some differences between "sand" and "sand" are as follows:

1) When it is related to nature, weather and meteorology, use "sand".

For example: sandstorm, sandstorm, desert, beach, you are the wind and I am the sand, etc. The "sand" here can be understood as very fine stone particles, which can only be blown up by strong winds. Related to the sound or not loud, use "sand", hoarseness, sand throat, rustling, rustling, etc.

2) When related to engineering, minerals and manufacturing, use "sand".

For example: cement mortar, emery, cinnabar, sandpaper, grinding wheel, river sand, mountain sand and sea sand. The "sand" here can be understood as finely divided stones. Personally, I think it is finer than "sand". Generally, it refers to substances as fine as sand, such as sugar and casserole.