1. The problem involves finding the volume of air in two conditions: at atmospheric pressure and inside a tyre. 2. Typically, the volume inside the tyre, $V$, can be related to atmospheric volume by the ideal gas law if pressure and temperature changes are considered. 3. Without specific values or formulas provided in the problem, the volume $V$ remains unknown, represented as $V = \square\ \text{cm}^3$. 4. To solve, please provide the atmospheric pressure, tyre pressure, temperature, or any relations between them. 5. Once those values are provided, we can apply the gas law or given formula to calculate $V$. 6. For example, assuming the air behaves ideally and temperature is constant, volume scales inversely with pressure: $$P_1 V_1 = P_2 V_2 \Rightarrow V_2 = \frac{P_1}{P_2} V_1$$. 7. Substitute known pressures and atmospheric volume $V_1$ to find $V_2$, the tyre volume. Note: Please provide missing data to proceed with calculation.