Step-by-step explanation:
When we want to boil pasta, we put water in a pan and place it on stove and wait for it till boiling. Then we can optionally put salt and a bit of oil in the boiling water in order to make pasta remain separate from each other and don't get stick. Then pasta is put in the boiling water. After 4 to 8 minutes of boiling pasta, the pasta expands and the mass of it gets bigger. It occupies more space after boiling. The water evaporates due to boiling, which is the natural common process.