ABSTRAC.

ABSTRAC.

The analytical balance is an instrument which allows us to measure the mass . It is used mainly for measuring small masses. while the scales were used to weigh larger objects. so that help us carry out precision measurements . This measuring instrument is the most used in laboratories. now they have modern scales that have the ability to give us a reading accuracy of up to 0.1mg 0.1g . 

There are two types of analytical balances , electronic , employing electromagnetic and mechanical systems , which are in day are replaced almost entirely by electronic for its greater accuracy , speed to operate and ease of use. 

The analytical balance has a maximum capacity between 120 - 200g . 

the reliability of the weighing results are closely related to its location and this should be placed in a place

-with very little vibration. 

-without drafts. 

-with as constant ambient    temperature and humidity . 

to carry the heavy must take into account : 

-directamnete substances not weigh on the weighing plate . 

-use a clean , dry container : a watch glass or container as small as possible. 

- the container and the load have to be weighed have the same temperature as the environment . 

- placing the material is to think of the center of the scale plate. 

at the end of the measurement process , removing the load from weighing plate 

- placing the material is to think of the center of the scale plate