It is about safety in the ...
Published by Adrian Ovezea, Executive Director of Sales and Marketing - Europe at Environmental Dynamics International (EDI)
It is about safety in the lab.
See and listen this: https://youtu.be/KUfRAyNMe3k
Mixing various concentrations of aqueous acid solutions.
Heat is released when strong acids are mixed with water. If you add water to acid, you form an extremely concentrated solution of acid initially and the solution may boil very violently, splashing concentrated acid. If you add acid to water, the solution that forms is very dilute and the small amount of heat released is not enough to vaporize and spatter it.
Always Add Acid to water, and never the reverse
See and listen this: https://youtu.be/KUfRAyNMe3k