eric_44794
In your case, a Digital Barometric Pressure Sensor would do the job. These types of sensors are used to measure the pressure of airs, just as you've mentioned in your project.
Here are a couple of options:
BMP280/BMP180 sensor: It is a compact sensor that uses I2C or SPI communication and can measure both temperature and pressure.
MPL3115A2 sensor: This sensor also communicates over I2C and can measure pressure, temperature, and altitude. You can connect it directly to your Pi’s I2C bus.
MS5637 sensor: This is an ultra-compact, I2C bus, and high-resolution sensor, which provide the measurement of pressure and temperature.
BME280: It's a very popular sensor that measures temperature, humidity, and pressure.