Definition of positive numbers: Numbers greater than 0 are called positive numbers. Positive numbers are usually preceded by a "+"symbol, which can usually be omitted. There are countless kinds of positive numbers, including positive integers, positive fractions and positive irrational numbers.
Geometric meaning of positive numbers: all points representing positive numbers on the number axis are on the right side of 0 on the number axis.
Positive examples:
We studied natural numbers in primary school; If there is no object, it is represented by 0. Sometimes the measurement and calculation can't get integer results, so it will be expressed by fractions and decimals.
There are two thermometers. The thermometer liquid level refers to the sixth scale below 0, indicating that the temperature is -6℃. Then the thermometer liquid level refers to the sixth scale above 0. How to indicate the temperature at this time?
Note: In order to distinguish between 6℃ above zero and 6℃ below zero, we introduced the concept of negative number.