He is an expert in experimental psychology.

He is spending a lot of time on experimental research.

He always buys cheap things, so in the end, it becomes 'penny wise and pound foolish'.

Acidic oxides react with water to produce acids.

Aluminum is an amphoteric oxide, it reacts with both acids and bases.

Peroxides play an important role in chemical reactions.

I will participate in an obstacle race this weekend.

In this situation, the proverb 'it is best to submit to circumstances' applies.

He is known as an expert in subcritical nuclear experiments.

Basic oxides react with acids to produce salt and water.