There are ________ irrational numbers between two rational numbers.

Let’s consider any two numbers.
For example, $\frac{3}{4}$and $\frac{4}{5}$
We know that$\frac{3}{4}=0.75$ and $\frac{4}{5}=0.8$
For a number to be irrational, it has to be non-terminating and non-recurring.
Thus, infinite numbers can be found between 0.75 and 0.8 which are non-terminating and non-recurring.