7.1

Objects That Less or More Dense than Water

• Some objects around us can float and sink in water. 

• Each object has a different density. 

• Objects that are less dense than water usually have many air spaces. Hence, it will float on the water surface. 

• Objects that are more dense than water usually do not have air spaces. Hence, the objects will sink in the water. 

• The density of oil, water and stone are different from one another. Hence, we can observe that the oil float on the water while the stone sink in the water. 

• The density of water can be increase by dissolving sugar or salt in water. 

• This is because dissolving sugar and salt in the water will increase the mass of the one unit volume of water. 

7.1

Objects That Less or More Dense than Water

• Some objects around us can float and sink in water. 

• Each object has a different density. 

• Objects that are less dense than water usually have many air spaces. Hence, it will float on the water surface. 

• Objects that are more dense than water usually do not have air spaces. Hence, the objects will sink in the water. 

• The density of oil, water and stone are different from one another. Hence, we can observe that the oil float on the water while the stone sink in the water. 

• The density of water can be increase by dissolving sugar or salt in water. 

• This is because dissolving sugar and salt in the water will increase the mass of the one unit volume of water.