2006-06-27 06:46:06 · 4 answers · asked by crobin1214 1 in Environment
We know how accurate and calibrated these instruments have been over the last 100 years. We can take an old measurement and adjust and evaluate it. For example, a 50 degree Farenheit measurement taken 50 years ago is probably 49.7 degrees plus or minus 0.4 degrees, but one taken 100 years ago is probably 49.2 degrees plus or minus 1.3 degrees.
100 years ago, there weren't nearly as many temperatures taken and carefully recorded as there are today. And when you're looking at climate changes, there were no 'measurements' ten thousand years ago. You need to see how far glaciers advanced or retreated and consider other indirect evidence.
2006-06-27 06:59:09 · answer #1 · answered by Frank N 7 · 1⤊ 1⤋
Yes, they were, thanks to Daniel Fahrenheit and Anders Celsius.
Both scientists created mercury thermometers that had consistent readings at low marks and at high marks (0 through 100 for Celsius and 32 through 212 for Fahrenheit).
When you discuss the temperature, the measurement is normally given in degrees Fahrenheit or degrees Celsius. You can also measure in Kelvin, which has a linear relationship with Celsius.
I do not know of any measurements taken the last 100 years with different scales, but if they referred to degrees Fahrenheit, Celsius, or Kelvin, then you know that it was calibrated the same way as today: With a specific measurement for the freezing point of water and a specific measurement for the boiling point of water.
2006-06-27 14:03:26 · answer #2 · answered by Rev Kev 5 · 0⤊ 0⤋
Maybe, search "heat island effect".
2006-06-27 13:50:31 · answer #3 · answered by Gekko 3 · 0⤊ 0⤋
no
2006-06-27 13:49:20 · answer #4 · answered by akg 3 · 0⤊ 0⤋