You are presented with the question "How can water vapor be detected?" and the following answer choices: 
- Thermometer
 - radiography
 - A computer
 - satellites
 - Barometer
 - Evaporation
 - Windmills
 - Solar panels

Now knowing that water vapor condensing in clouds causes rain and if it's raining AND barometer is steady, then predict rain, choose the best answer.


 

     Barometer    