The relative density of kerosene is 0.8g/cm. The relative density of groundnut oil is 0.93g/cm. Relative density is also known as specific gravity. The ratio of relative density is a substance to the density of the water.
“My cat was back and so was I” means that he had found his cat and he himself had a new outlook on life. He got his cat back after he had lost all hope of finding it. He said that he was also back because he had a feeling of gratitude for his life now.