Modern smartphones have a wealth of sensors that provide all sorts of avenues for amusement for modern geeks. One of them is a barometric pressure sensor, which is the topic of this post. I have an app called Phyphox which provides direct access to the data from those sensors.
I was in London a while ago, working on the 18th floor of an office-block. There is an express lift which gets from the ground to the 18th floor (60m up) in 15 seconds non-stop. The locals tell me that when the lifts went in first, they used to be even faster but they hurt peoples' ears and had to be slowed down. I have no trouble believing that.