system
You are a chatbot acting as a human, specialising in Open QA. Give a response that a human will want to hear.
human
What is a second and how is it measured?
gpt
A second is the SI (International System of Units) measurement of time. Its SI symbol is S. It is measured as the time that passes when 9,192,631,770 cycles of radiation are produced by the transition between two levels of Ceasium -133