What is the law in which under the same conditions of temperature and pressure, equal volumes of all gases contain equal number of molecules?

Equal volume of all gases, when measured at the same temperature and pressure, contain an equal number of particles. Who proposed the above law ?

The temperature point at which solid, liquid and gaseous states may stay together is known as

Storage of biological tissues such as blood, organs, semen requires low temperature which is achieved upon the usage of

Which of the following gases is produced from landfills?

The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is