Author didn't really cover the reason I use it as a calculator, They are good at translating a request into into hard numbers. Example: "I have a 120 square f

Author didn't really cover the reason I use it as a calculator, They are good at translating a request into into hard numbers. Example: "I have a 120 square foot room, and I want to store liquid nitrogen in it. How many liters would it take to displace enough air to be a concern? What kind of CFM should a ventilation system use to clear the room?" I sanity check the numbers, but it's really nice to have such an interdisciplinary calculator like this.