The thickness of a math book will change due to various factors, including the purpose, content and binding method of the book. Generally speaking, the thickness of the external seal of a conventional math book is about 8 mm

We can see from the use of books. Mathematics textbooks are usually thicker than mathematics research works. This is because textbooks need to contain more basic knowledge, examples, exercises and illustrations to help students better understand and master mathematics knowledge. In addition, because textbooks need to meet the learning needs of students at different levels, they are usually thicker than other math books.

We can see the thickness of the math book from the content. For example, a book focusing on a specific field of mathematics may be thinner than a textbook covering multiple fields. This is because books that focus on a certain field need to contain less content, while textbooks that cover many fields need to contain more knowledge points and examples.

The thickness of a math book can be seen from the way it is bound. Hardcover books are usually cardboard covers with thick paper and binding lines, which makes them heavier than paperbacks. Paperback usually has only one cover and one inner page, so it is relatively thin.

Units commonly used in life:

1, length unit: meters, kilometers, centimeters, millimeters, feet, inches, etc. In daily life, these units are used to describe the size and distance of objects. For example, the area of a house can be calculated in square meters, while the distance can be calculated in kilometers or miles.

2. Weight unit: kilogram, gram, kilogram, pound, etc. These units are used to describe the weight or mass of an object. For example, when buying food or goods, the weight is usually described in kilograms or grams.

3. Time unit: seconds, minutes, hours, days, weeks, months, years, etc. These units are used to describe the length of time. For example, the time of getting up, sleeping and working in daily life can be described by these units.

4. Degree-day: Celsius, Fahrenheit, etc. These units are used to describe the temperature of an object. For example, the temperature in weather forecast is usually expressed in degrees Celsius or degrees Fahrenheit.