Answer the following question given this paragraph: 

The thermometer was developed a short time after the barometer made it possible to study pressure in a quantitative manner. Although crude thermometers had been available for quite some time, Daniel Fahrenheit constructed a more accurate thermometer in 1724 using mercury in glass. Because the height of the mercury in the thermometer was a relative measure, certain fixed points needed to be defined. Originally, Fahrenheit defined a 1:1:1 mixture of ice, salt, and ammonium chloride as 0°F, and the freezing/melting point of ice as 32°F. On this scale, the normal temperature of the human body is 96°F, and the boiling point of water is 212°C. The modern Fahrenheit scale is defined in terms of the normal freezing and boiling points of water.


Q: What instrument made it possible to study pressure quantitatively?

 Choices:

- anemometer

- seismograph

- thermometer

- barometer

A:
barometer
