Imagine that you tilt the thermometer and put everything away except its scala.[br]Then you would get something like below, where the two points A and B represent the values of two seperate thermometers.

Tasks:[br]1) Calculate the difference between the two values on the scala of A and B.[br][br]2) Tick the box "Show arrow" and try to find out, what the red arrow exactly means.[br][br]3) Tick the box "Show calculation" to see the background calculation.