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.
The Universal Gas Constant-Ru-appears in the ideal gas law and can be expressed as the product between the Individual Gas Constant-R - for the particular gas-and the Molecular Weight-Mgas-for the gas, and is the same for all ideal or perfect gases : Ru = Mgas R (1). where. Ru = universal gas constant.