# The properties of the mass

Measuring devices of the mass .

The mass is the amount of the matter in an object ,  The mass of any matter is a fixed value , It does not change by changing the state of the matter and the place of the matter , The mass of an object increases when the amount of the matter in it increases and vice versa .

All the matter have the mass whatever their physical states ( solids , liquids or gases ) , All the matter have the mass whatever their  shapes ( one piece , particles , powder , pure or mixture ) .

All the matter have the mass whatever their places ( in hand , on the moon or any other planet ) , If you measure the mass of an object on the Earth’s surface , then measure the mass of the same object on the moon’s surface , you will notice that the mass is not changed .

## The measuring units of the mass

The mass is measured by the gram , the kilogram or the ton , the ton is used to measure the very big masses , The gram ( g ) may equal the mass of one paper clip and it is suitable for measuring the small masses such as the jewellery .

The kilogram ( kg ) equals the mass of one liter of distilled water at the normal temperature , and it is suitable for measuring the large masses as the fruits and the vegetables .

## The measuring devices of the mass

The mass is measured by the different types of scales as  two-arms scale and one-arm scale , Two-arms scale is divided into the balance scale and the sensitive two-arms scale , The balance scale is used to measure the large masses as the cheese and the vegetables .

The sensitive two-arms scale is used to measure the small masses as the gold and the chemicals , One-arm scale is divided into one-arm digital scale and one-arm scale with pointer .