I know it's not a new invention and most of us know how it works to act as transducer between air pressure (ie sound waves) and current. But the idea behind it is always to capture intelligible sound. The idea that I propose is based on the same scheme as microphone but for the purpose of generating electricity. We can think of huge or array of microphones installed near noisy or windy places to perform like windmill but at very low cost.

Think of a tire with many cavities of different pressure arranged radially or vertically or a mixture of both. How these tyres will perform on road I really don't know, but maybe they will reduce the braking distance.

Some times you need to take an aspirin to stop a headache but you dont have any water or juice to do so. A chewing gum aspirin would be a handy solution. This method could be generalized to other medicine especially for children.

A seat driver which adjusts its level automatically to keep the same gravity center laterally even when the car inclined.

It mays seem foolish, but when you see pressure at work and how it drives many tools I have thougth it could be possible. So the idea is why not use pressure to drive directly the wheels or the shaft. The pressure could be generated from chemical mixture.