I want to ask the next balance, can you give details, how to use the balance

Here's how to make a balance by hand:

1. The practice of making a balance with a paper cup:

Tie two wooden sticks together with a rubber band, pass the paper cup with a needle and thread, tie the threads together, fix the pushpin on the wooden stick, and take another wooden stick as the scale of the balance, and the handmade balance is ready. <>

2. The practice of making a balance with cardboard:

Glue the cardboard together according to the first step board, cut off the upper part of the paper cup with a knife, leaving only half of the part, and use the thread to pass the paper cup through the small hole fixed in the cardboard, and the handmade balance is ready. <>

3. The practice of making a balance with a plastic bottle:

Thread the thread through the small hole in the cap, fix the small wooden stick, then tighten the cap, use scissors to thread two small holes in the paper cup, and then thread the thread through it, and hang the paper cup on the small wooden stick.

Here's how to make a balance:

1. The practice of making a balance with a paper cup:

Tie two wooden sticks together with a rubber band, pass the paper cup with a needle and thread, tie the threads together, fix the pushpin on the wooden stick, and take another wooden stick as the scale of the balance, and the handmade balance is ready.

2. The practice of making a balance with cardboard:

Glue the cardboard together, cut off the top half of the paper cup with a knife, leaving only half of the part, and use a thread to pass the paper cup through the small hole, and the handmade balance is ready.

3. The practice of making a balance with a plastic bottle:

Thread the thread through the small hole in the cap, fix the small wooden stick, tighten the cap, use scissors to thread two small holes in the paper cup, and then thread the thread through it, and hang the paper cup on the small wooden stick.

A balance is a measuring tool.

The balance is an instrument to measure the mass of the object, made according to the principle of the lever, there is a small plate at each end of the lever, one end of the weight, the other end of the object to be weighed, the lever ** is equipped with a pointer, when the two ends are balanced, the mass (weight) of both ends is equal.

According to papyrus, the Egyptians used scales as early as more than 1500 BC. Other scholars say that it may have been earlier than that, about 5,000 years ago. Although the ancient Egyptian balance was very rough, it already had the outline of the modern balance and became the prototype of the modern balance.

In ancient China, there were also instruments with a balance structure, which were produced earlier. By the late Spring and Autumn period, the manufacturing technology of balances and weights was quite sophisticated. The bamboo piece is used as the beam, the silk thread is the button, and a copper plate is hung at each end.

Later, because the balance weighed objects was more troublesome, it was changed to "Quan", and the balance was used when weighing small objects.

The game code of the balance is to look at the left, and pay attention to the left and right code when weighing (the value of the game code is subject to the left alignment scale mark).

Before use, the balance should be balanced left and right, and the balance nut must be adjusted in the opposite direction by "0", using the formula: left high-end, left-adjusted.

Precautions for use:

1. Move the code to the zero scale line in advance, and adjust the balance nut, it is best to use tweezers when adjusting the balance nut to balance the balance left and right.

2. Put the weight on the right and the object on the left.

3. The weight should not be held by hand, but should be picked with tweezers. When using the balance game, the code cannot be moved by hand.

4. Objects that are too cold and too hot should not be weighed on the balance. It should be placed in the dryer until room temperature before weighing.

5. The weights should be added from large to small, which can save time.

6. During the weighing process, do not touch the balance nut again.

The names of the various parts of the balance are shown below:

Extended Resources:

1. Scales

A balance, a weighing instrument. Two arms are formed by the fulcrum (axis) supporting the balance beam in the center of the beam, and a disc is hung on each arm, one of which holds an object of known mass and the other disc holds the object to be measured, and the deflection of the pointer fixed on the beam when it does not swing and points to the center scale indicates the mass of the object to be measured. A balance is a equal-arm lever.

A balance is a weighing instrument, which is an instrument that measures the mass of an object. It is made according to the principle of lever, there is a small plate at each end of the lever, one end of the weight, the other end of the object to be weighed, the lever ** is equipped with a pointer, when the two ends are balanced, the mass (weight) of both ends is equal. Modern balances are becoming more and more sophisticated, more and more sensitive, and there are more and more types.

We all know that there are ordinary balances, analytical balances, constant analytical balances, micro analytical balances, semi-micro analytical balances, and so on.

Second, the use of the balance

To be placed in a horizontal place. The game code should be reset to zero.

Adjust the balance nut (the nut at both ends of the balance) to adjust the zero point until the finger is aligned with the ** scale mark.

The left tray is placed to weigh the object, and the right tray is placed with weights (left object right yard). According to the properties of the weighed object, it should be placed on glassware or clean paper, and the mass of the glassware or paper piece should be weighed on the same balance in advance, and then the substance to be weighed should be weighed.

The added weights are gradually reduced from the maximum value of the estimated weighed object. Pallet balances can only be weighed to the gram. Add or subtract weights and move the yard on the ruler until the pointer is aligned with the tick mark again.

Objects that are too cold or too hot should not be weighed on a balance. It should be weighed (or weighed in a special vessel) after being placed in a desiccator at room temperature.

The mass of the object = weight of the weight + the number of degrees displayed by the code.

The weights must be handled gently with tweezers, and the weights should be placed in the weight box, and the yards should be moved back to the zero point after weighing.

When weighing dry solid pharmaceutical products, a sheet of paper of the same quality should be placed on each of the two trays, and then the drug should be weighed on the paper.

Drugs that are prone to deliquescent must be weighed in glassware (e.g., small beakers, surface dishes).

If the weight is rusty, the measurement result is small; If the weight is worn, the measurement result is too large.

If it's heavier than him.

1. For the first time, there are 6 parties on both sides, see which side is heavier, and stay.

2. The remaining 6 balls are divided into 3 on each side, depending on which side is heavier.

3. The remaining 3 balls, one at a time, if they are equal, then the remaining one is different; If you don't wait, the heavier one is the different one. Vice versa.

If you don't know the severity, or some other situation.

So. 1. Divided into 2 groups, the first group of 4 and the second group of 8.

2. Call the second group first, 4 on each side of the second group, look at the situation, if it is equal, then the different one is in the first group. The first - group is weighing, 2 on one side, and then weighing.

3. If the two sides are different, the 4 on the light or heavy side, 2 on one side are weighed separately, and the 2 on the light or heavy side are weighed for the third time.

First, divide the 12 balls into three equal portions of four.

Take out two of them and place them on both sides of the scale (for the first time).

Situation 1: The balance is balanced by the rocks.

Then the eight balls that are weighed are normal, and the special ones are in the four.

Take three of the remaining four balls and put them aside, and put three normal balls on the other side (the second time).

If the balance is balanced, the special one is the one left.

If it's not balanced, it's in the three above the scale. And know whether it's heavy or light.

Two of the remaining three are weighed, because you already know the weight, so you can know the special. (for the third time).

Scenario 2: The scales are tilted.

Special balls are inside those eight on the scale.

The four balls on the heavier side are counted as a1, a2, a3, and a4, and the light ones are counted as b1, b2, b3, and b4.

The remainder is determined to be four normal, denoted as C.

Put A1, A2, A3, and A4 aside, and B1 and the three normal C balls aside. (for the second time).

Situation 1: The scales are balanced.

The special balls are in A2, A3, and A4, and you know that the special balls are heavier.

Weigh A2 and A3 to know which of the three is special. (for the third time).

Situation 2: The balance is still heavier on the side of the Lianghuai A1.

Special balls are between A1 and B1.

Just take one and the normal scale, and you will know which one is special. (for the third time).

Situation 3: The balance is reversed, and B1 is heavier.

The special ball is in the middle of B2, B3, and B4, and you know that the special ball is lighter.

Weigh B2 and B3 to know which one is special. (for the third time).