What is one and a half?

One and a half (1.5) is a numerical value that denotes one whole unit plus half of another unit. It is commonly represented in decimal form as 1.5 and as a fraction as 3/2. One and a half can be used to describe quantities, measurements, and time intervals. For example, one and a half cups of flour or one hour and thirty minutes. It can also be used in statistics to represent a midpoint between two data points on a scale or in chemistry to denote the number of atoms in a molecule. Additionally, one and a half is a popular phrase used in idiomatic expressions, such as "one and a half of one thing and six of another," which means a mixture of different proportions.