In the Northern Hemisphere, the summer season starts on June 20 or 21 termed as the summer solstice. It occurs as the axis of rotation gets tilted towards the Sun by full 23.5 degrees and attaining the most direct sunlight of the annum during the longest day. On the other hand, the Southern Hemisphere has its winter solstice, that is, the shortest day of the annum, as the axis of rotation gets tilted away from the Sun.
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
