A soft keyboard (sometimes called an onscreen keyboard or software keyboard) is a system that replaces the hardware keyboard on a computing device with an on-screen image map.
An ideal gas is defined as one in which all collisions between atoms or molecules are perfectly eleastic and in which there are no intermolecular attractive forces. One can visualize it as a collection of perfectly hard spheres which collide but which otherwise do not interact with each other.
Ideal Gas Law Introduction: Discusses the ideal gas law PV = nRT, and how you use the different values for R: 0.0821, 8.31, and 62.4. Ideal Gas Law Equation The Ideal Gas Equation is given by: