The number of whistle-boiled rice that can be cooked in a pressure cooker depends on the size and capacity of the pressure cooker, as well as the amount of rice and water you use.
A standard 6-quart (approximately 5.7 liters) pressure cooker can typically cook around 3 to 4 cups of uncooked rice. Keep in mind that rice expands as it cooks, roughly doubling in volume, so 1 cup of uncooked rice will yield about 2 cups of cooked rice.
To cook rice in a pressure cooker, the general ratio of rice to water is 1:1.5 or 1:2 (rice to water). For example, for 2 cups of uncooked rice, you would use about 3 to 4 cups of water.
Please refer to the user manual of your specific pressure cooker model for guidelines on capacity and recommended maximum fill levels. Overfilling the pressure cooker can cause it to malfunction and may lead to safety issues.
As always, it's essential to follow proper cooking instructions and safety precautions when using a pressure cooker to ensure a successful and safe cooking experience.