Precise and up to the point. Excellent.

Wow,this is the only thing I needed. Short and simple to revise the process

Interestingly depicted!

The video was very nice. Keep it up.

Thank you!!

i skipped class but when i watched this video, i know how ion exchange works :)

@kurukurkur9767

5 жыл бұрын

why did u skip your class? that's not good

thank you

Great video. Thank you.

what resis is that??

I have questions

Chatha la undhi