What is a thermometer?
Q: What is a thermometer?
A: A thermometer is an instrument for measuring or showing temperature.
Q: What are the two types of thermometers mentioned in the text?
A: The two types of thermometers mentioned in the text are a concealed glass tube containing mercury or alcohol and a digital thermometer.
Q: How did early thermometers from the time of Galileo measure temperature?
A: Early thermometers from the time of Galileo measured the expansion and contraction of air.
Q: What did many thermometers use after the middle 17th century?
A: Many thermometers used alcohol or mercury after the middle 17th century.
Q: What kind of thermometer was invented in the 19th century?
A: A mechanical thermometer was invented in the 19th century.
Q: How did the mechanical thermometer work?
A: The mechanical thermometer worked by using a bimetallic strip to move a pointer.
Q: Is the mechanical thermometer still in use today?
A: Yes, the mechanical thermometer is still popular where people like to read temperature from a distance.
