The pronunciation of the ruler is three tones, chǐ.
A ruler is a measure of length that is often used to measure length, width, or height. It is usually made of materials such as plastic, metal, or wood, and has a flat surface and an edge that is used to measure the scale. The scale is usually measured in centimeters or inches and is used to measure the size or distance of an object.
Rulers are very common in people's daily life and work, and are widely used in fields such as architecture, design, crafts, and scientific experiments. It is a basic measurement tool that helps people accurately understand and describe the size and shape of an object.
Different types of rulers: Rulers come in different types and uses, such as tape measures, tape measures, rulers, protractors, etc. Tape measures and tape measures are often used to measure long or soft objects, such as cloth or string;Rulers are used to measure short objects or line segments;A protractor is used to measure angles.
The material of the ruler: The material of the ruler can be plastic, metal, wood, etc. Different materials of rulers have different characteristics and uses, for example, metal rulers are usually more durable and suitable for use in industrial and construction fields;Plastic rulers, on the other hand, are lighter and suitable for use by primary school students.
Reading of scales: Reading scales on a ruler requires a certain amount of skill and experience. First of all, make sure that the line of sight is perpendicular to the scale, so that visual errors can be avoided;Second, pay attention to unit conversions, such as converting between metric and imperial units.
Maintenance of rulers: Rulers are a consumable item that requires regular maintenance and upkeep. For example, gently wiping the surface of a ruler with a soft cloth can remove dust and dirt;Avoid leaving the ruler in a high or low temperature environment, which will avoid the ruler from deforming or breaking;Do not use the ruler as a knife or scratch other items, this will avoid damage to the ruler.
How to use the ruler: When using the ruler, you need to pay attention to safety, such as not putting your fingers on the edge of the ruler to avoid cutting your fingers;When using a protractor, be careful to align the corner vertices with the zero tick mark so that the angle can be accurately measured.
Rulers have a long history. In China, the earliest rulers appeared in the Shang Dynasty, but people at that time used a measuring tool called a "moment", which was made of a straight wooden stick and was mainly used to measure the length and width of the land. Over time, people began to carve scales on wooden sticks, which led to the invention of rulers with scales.
In ancient times, the length and size of rulers varied depending on the region and culture. For example, in ancient Egypt, people used rope as a measuring tool, while during the ancient Greek and Roman empires, people used a ruler called "stagira", which was made of a long strip of metal.
In China, the length and size of the ruler also varied from dynasty to dynasty. For example, during the Shang Dynasty and the Western Zhou Dynasty, the length of one foot was shorter, about 1695 cm;In the Song and Yuan dynasties, the length of one foot was longer, about 31 today68 cm.
Over time, the shape and function of the ruler has also improved. For example, in the mid-19th century, the French engineer Jean-Charles Amanda invented a measuring tool called the "Amanda ruler", which had a retractable ruler body and multiple movable scales that could be used to measure objects of different sizes.
Overall, the development process of the ruler is a process of continuous improvement and innovation. Today, the ruler we use is no longer a simple stick or metal bar, but a high-precision measuring tool made of high-tech materials.