How strong is stomach acid?

The stomach acid is about 0.1 M hydrochloric acid, which is a strong acid. The pH of the stomach acid is about 1.

It’s very very acid. If you take that acid and put it in your palm you will get severe burns

Stomach acid is a very strong acid - hydrochloric acid which dissociates completely.
If you want the concentration of HCl in stomach acid: This is +/- 0.1M
The pH of stomach acid is +/- 1.0

HCl--------1~2pH value

stomach acid is powerful for our food.

Extremely, it's hydrochloric acid.

It varies, but can go as low as 1.5 pH, which is pretty intense. It doesn't eat your stomach because the stomach lining secretes a protective layer of mucus.

Not that strong cuz I always find some undigested corn in my pooop.

Have you ever seen aliens?