Help me

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

In this thread, i would like you to comment on the nature of light and how operation of telescopes. light has a duality of a particle and a wave; which one affects your life? also how does light interact with optics inside telescopic systems? answer these questions in two paragraphs. then respond the another students response.

It takes a lot of energy to get the temperature of water to increase and eventually boil because water has a high heat.