Какую физическую величину называют напряжением? Какова единица напряжения в СИ?

1. It‟s raining …  C. heavily
2. The book is worth …  B. reading
3. What a tremendous … of thunder! B. clap
4. There has been … frost. A. a hard
5. It was raining ….  C. cats and dogs
6. It was 20 degrees in … shade yesterday. A. the
7. It‟s lovely weather for …  B. ducks
8. The spring is … air.  B. in the
9. The car driver splashed mud … us. A. on
10. She was shivering … cold. A. from