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.
An ideal gas can follow the formula PV=nRT. (P-pressure, V-volume, n-amount of moles, R-Avogrado constant, T-absolute temperature). A real gas does not always follow this formula. 1  An ideal gas is infinitely compressible, a real gas will condense to a liquid at some pressure. 2  The particles of an ideal gas lose no energy to its container. 3  A real gas conducts and radiates heat, thereby losing energy.