A ratio scale is a type of measurement scale that has a true zero point, allowing for the comparison of absolute magnitudes. This means that not only can you say that one value is greater or less than another, but you can also say how many times greater one value is compared to another. Examples of ratio scales include measurements like height, weight, and temperature in Kelvin. In a ratio scale, mathematical operations such as addition, subtraction, multiplication, and division are meaningful. For instance, if one person weighs 60 kg and another weighs 30 kg, you can say that the first person is twice as heavy as the second. This property makes ratio scales particularly useful in fields like science and statistics for precise data analysis.