Ahelium filled balloon is designed to rise to a height of 50 km at which point it will be fully inflated and have the volume of one hundred thousand litres. at that altitude the temperature is -5°c and atmosphere pressure is 1.52 mm. how many litres of helium at ntp will be required to fully inflate the balloon and what will be it's weight

Asubstance is held in an open container. its particles move past one another at random speeds but do not leave the container. heat is removed from the system, and the particles slow down. when enough heat is removed, the particles no longer have enough speed to overcome the weak attractive forces between them. when this happens, the substance enters its solid state. the process described above is known as .