Is it unethical to work for two professors (two seperate research lab in two non-related fields) at the same time? I am an undergrad student currently working for professor A in a full-time research assistant co-op job. On the other hand, I volunteer using my spare time working for another research lab in an almost unrelated field. Professor A doesn’t know about this.

So my question is, is it unehtical for me to do this?

I ask because my friends warned me not to do this. On the other hand, I don’t think it is too much of issue since I am not stealling data or anything from anyone and, more importantly, they are in two different unrelated fields.

Similiar question is asked here, but I am asking from an ethical perspective.