The iPhone 6 has been rumored to include a number of new environmental sensors such as an atmospheric pressure sensor.
Some new leaks have made it our way through Weibo user GeekBar and these focus on the new "Phosphorus" component that was interpreted as the next-generation version of Apple's M7 co-processor. We all are aware of the M7 and how it detects tracks motion data from various sensors in the iPhone 5s, iPad Air, and Retina iPad mini but for the iPhone 6 we are expecting a more powerful version of the M7 because of the phone being loaded with a number of new health- and fitness-related sensors.
But according to another user, this new item which we have seen on the schematics is not another version of the M7 and looks more like the barometric pressure sensor. This also sounds convincing because the previous leaks have told how the iPhone 6 is going to be loaded with a number of new environmental sensors such as an atmospheric pressure sensor.
According to this user, leecbaker, “The chip pictured has the part number BMP282. I'm 99.99% sure this is a Bosch barometric pressure sensor, similar to this part BMP280. Variants of one part often have slightly different part numbers- if Apple got Bosch to customize the chip for them with different packaging, or a slightly different measurement range, that would explain the difference in part number.”