Fantastic! Oxygen has mass and also occupies space. For example, when you inhale air, your lungs grow in size due to gases like oxygen.
Take two numbers, say $$5$$ and $$6$$. You can find a number between $$5$$ and $$6$$, say $$5.5$$. Now, between $$5$$ and $$5.5$$, you can find $$5.25$$. Between $$5$$ and $$5.25$$, you can find $$5.125$$.
Can you keep doing this? Given two different real numbers, can you always find another real number between them? (Real numbers are numbers that have decimals.)
• Yes
• No
• Depends on the numbers