A calculator for solving problems based on the Ideal Gas Law (PV=nRT). Users can input values for pressure (P), volume (V), moles of gas (n), and temperature (T) in various units. The tool solves for the unknown variable. It also includes options for calculating work done by or on a gas during isobaric, isothermal, or adiabatic processes. This makes it a comprehensive tool for students studying thermodynamics and physical chemistry.