1. Carbohydrate is an aldehyde or ketone compound with multiple hydroxyl groups (two or more), which can become an organic compound of the above two after hydrolysis. Chemically, because it is composed of carbon, hydrogen and oxygen, similar to the polymerization of carbon and water in the chemical formula, it is also called carbohydrate.

2. Salt (table salt) is white crystalline powder or granular, odorless, salty and soluble in water. Its scientific name is sodium chloride.

The simple substance (free form) of gold, commonly known as gold, is a popular precious metal, which has been used as currency, preservation and jewelry for many centuries. In nature, gold exists in the form of simple substance in gold nuggets or rocks, underground veins and alluvium. Gold is also one of the currency metals.

4. Fruit (plant fruit with more water and sugar) Fruit refers to the fleshy edible plant fruit, whose main taste is sweet and sour. Fruit is not only nutritious, but also promotes digestion.

5. Rice (food) Rice is a finished product made of rice after washing, shelling, grinding and finishing. ? Rice embryo and aleurone layer contain nearly 64% of rice nutrition and more than 90% of nutrients needed by human body, which are the main foods of southerners.

Extended data:

Kilogram is the unit of mass, and mass is equivalent to how "heavy" a thing is every day. However, quality is actually an attribute with "inertia"; In other words, an object will tend to maintain its current speed without external force. When an object with a mass of one kilogram is subjected to a force of one Newton, it will get an acceleration of one meter per second squared.

The weight of matter depends entirely on the local gravitational intensity, while the mass is constant (assuming that the mass does not move relative to the observer at relativistic speed). Accordingly, astronauts in microgravity can lift objects in the space capsule effortlessly; Because objects are weightless. However, an object still maintains its mass in microgravity, and astronauts need to exert ten times the force to accelerate an object with ten times the mass at the same acceleration.

References:

Baidu encyclopedia: kg