How to use a student balance and why a student balance should be called a student balance

Steps: Place the balance on a horizontal tabletop;

Move the code to the left end of the scale at the "0" scale;

Adjust the balance nuts at both ends of the beam so that the pointer points to the red line of the dial;

Place the object on the left side of the scale and the weight on the right side of the scale;

Add and subtract weights and move the yard to rebalance the balance beam.

Then the mass of the measured object is equal to the weight mass and the indicator value of the traveling code.

Steps: (Note that sometimes some corroded items cannot be placed directly, and small pieces of paper need to be added on both sides.) ）

Place the balance on a level tabletop;

Move the code to the left end of the scale at the "0" scale;

Adjust the balance nuts at both ends of the beam so that the pointer points to the red line of the dial;

Place the object on the left side of the scale and the weight on the right side of the scale;

Add and subtract weights and move the yard to rebalance the balance beam. Then the mass of the measured object is equal to the weight mass and the indicator value of the traveling code. (Left object right weight, don't get me wrong).

First move the code to the far left, adjust the balance nut, point the pointer on the scale plate to the red line (there are no other items on the tray on both sides at this time), and then place the object that needs to be measured on the left (if it is powder or the like, you need to place a piece of paper on the tray and then put the powder), place the weight on the right, and adjust the code at the appropriate time until the two sides are balanced.

The student balance refers to the balance used in the main teaching laboratory, which is mainly composed of a yard, a ruler, a balance nut, a base plate, a graduation dial, a lead ant beam pointer, a heavy vertical line, etc. Student scales are only used as a general measure of matter. Physical balances, on the other hand, are widely used for precise measurement of various substances.

A balance is an instrument that weighs the mass of an object. Physics balances, student balances, and tray balances are commonly buried in middle school physics labs. These balances are made using the principle that the forces acting on the arm of equal force are equal when the lever is balanced.

When using the balance, the following steps are generally followed:

1. Place the balance on a horizontal tabletop;

2. Remove the rubber washer under the balance tray support;

3. Move the code to the zero scale at the left end;

4. Adjust the balance nut so that the pointer points to the ruler**;

5. Place the object on the left side of the scale;

6. According to the estimate, use tweezers to select the appropriate weights from the weight box in order from large to small, and put them from the middle of the right plate of the balance;

7. When the right end of the balance sinks when the minimum weight is put in, the minimum weight is taken away purely and the balance is adjusted by moving the code instead;

8. The sum of the total mass of the weight as the base and the value of the free code is recorded in the experimental report;

9. Use tweezers to put the weights back into the weight box and place the rubber washer under the tray holder.

There are a few things to keep in mind when operating the balance:

1. When adjusting the balance of the balance beam, in order to reduce the time used, as long as the pointer swings the same amplitude on the left and right of the red line of the ruler (that is, for the symmetry of the red line), it can be considered balanced, and it is not necessary to wait for the pointer to stop;

2. After adjusting the balance beam:

The scales can no longer move. If there is movement, it must be readjusted;

The left and right sides of the balance are not interchangeable;

3. When the balance weighs the mass of the object, the balance of the beam needs to be adjusted twice before and after: when adjusting before weighing, the code must be moved to the zero scale first, and then the balance nuts at both ends of the beam must be adjusted; In weighing, the balance of the beam can only be adjusted by adding or subtracting weights and moving the yard.

4. If you weigh chemicals, you must put paper on the tray in advance.

5. The measured object and weight should be handled gently, and the weight should not be held directly by hand.

Finally, it is also necessary to note that when weighing chemicals, do not put the drug in the tray, use filter paper or a beaker, if you weigh corrosive drugs such as sodium hydroxide, etc., be sure to weigh in a small beaker.

Start by drilling two small holes (symmetrical places) in the cap of the bottle

Thread the wool through the two holes and screw the lid on.

Place the chopsticks (preferably a straight stick) on the lid, find the balance, and hold the chopsticks in place with a string that runs through the lid.

Hang two paper cups on each end of the chopsticks, and the paper cups are pre-threaded with ropes.

To be honest, I have always felt that people's self-control, a person's self-discipline ability, is innate, although it is said that there is an acquired influence, but the most important thing is an innate characteristic. Here's how I see it. And I've observed this through a lot of people.

But in the sea of books, our souls can indeed fly.

I've always been a book lover since I was a child. Regardless of my a

Less, each of my books is well preserved. The number of pages that there is.

Yellow, but the corners are flat. My book is my treasure, and it is a harbor for my speechless friends to dock for me. When lost.

It's a magical spirit that gives me the strength to move forward. It had giving

A sky of my own, which has led me out of my love.

It is like a wise man who teaches me to grow. Always speechless of it, actually.

The thousands of words in our hearts have long been engraved in our hearts.

Nowadays, there are more and more bookstores, but they are not as crowded as they used to be.

Trouble. People hurriedly walked by, mostly under the pretext of the word "busy". Busy.

We left the book on that cold shelf, and it still is.

Speechless, but it is inevitable that there will be many holes in my heart. There are no more people who write books.

Interesting, the content of the book is boring, and the value of the book has plummeted. This.

It is inevitable that people will pay more and more attention to the book. Walk into the bookstore, the book.

There are so many kinds that it is like a huge banquet. But people mostly stopped.

Stay in front of books such as counseling books and magazines, and those that were once famous.

Most of the Chinese and foreign history and famous works have been forgotten. Book, like a hand.

The balance is closed and the oak count is 28g

Because it didn't zero correctly, it's too much.

Therefore, the mass of the object should be measured as.