Celsius Made His Thermometer Upside Down

How did Anders Celsius originally define the freezing and boiling points of water on his temperature scale?

• 0°C for freezing, 100°C for boiling

• 100°C for freezing, 0°C for boiling

• 32°C for freezing, 212°C for boiling

• 0°C for boiling, 150°C for freezing

What was a likely reason Celsius and De L'Isle used an "upside down" scale where numbers increased as temperature decreased?

• To make it easier to read in cold climates.

• To avoid using negative numbers for common temperatures.

• They believed colder temperatures had higher numerical values.

• It was a common practice for all thermometers at the time.

Who is credited with creating a thermometer scale that set 0 degrees at the freezing point of water and 100 degrees at the boiling point, similar to the modern Celsius scale?

• Anders Celsius

• Carl Linnaeus

• Jean Pierre Christin

• Ekström

How was the original Celsius temperature scale defined?

• 0 degrees at water's boiling point and 100 degrees at its freezing point.

• 0 degrees at water's freezing point and 100 degrees at its boiling point.

• 0 degrees at the triple point of water and 100 degrees at absolute zero.

• 0 degrees at the deepest cellar of the Paris Observatory and 100 degrees at the hottest summer day.

What was a major problem with temperature measurement before Celsius's work?

• There were too few temperature scales, making comparisons difficult.

• Thermometers were too expensive for most scientists to use.

• Many different and unreliable reference points were used, making accurate and shareable measurements nearly impossible.

• Scientists refused to share their temperature data with each other.

What was Celsius's most important contribution to temperature measurement?

• He invented the first thermometer.

• He discovered absolute zero.

• He established reliable physical processes, like melting snow and boiling water under specific pressures, as fixed reference points.

• He created the Kelvin scale.

How is the Celsius temperature scale defined today?

• Based on the freezing and boiling points of pure water.

• Based on the Kelvin scale, using the triple point of water.

• Based on the melting temperature of butter.

• Based on the internal temperature of certain animals.