(1) Iron bar is heavier than a wooden bar of same size.
(2) A ballon filled with hydrogen rises up in the air.
(3) A material floats in water but sinks in oil why?
(4) What will happen to the density with the change in temperature?
(5) Iron nail sinks in water while a ship floats.
Answers
Answer:
PLS MARK BRILIANT
Explanation:
AND THANK ALSO
Answer:
(1) So in iron there is more molecules than wood in same volume. More molecules means more mass, that's why iron is much heavier than wood for same volume.
(2) Hydrogen filled balloons generally rises up in the air. This is because hydrogen is less dense and its weight is also less than the air. The one filled with carbon dioxide generally sinks down as it is denser than the air and due to its heavy weight, it cannot rise up to the ceiling.
(3) Alcohol floats on oil and water sinks in oil. Water, alcohol, and oil layer well because of their densities, but also because the oil layer does not dissolve in either liquid. The oil keeps the water and alcohol separated so that they do not dissolve in one another.Water sinks because it is more dense than oil.
(4) The density of water can also be affected by temperature. When the same amount of water is heated or cooled, its density changes. When the water is heated, it expands, increasing in volume.The warmer the water, the more space it takes up, and the lower its density.
(5) In case of the iron nail, the weight of the needle is more than the weight of the water displaced. Hence nail sinks and ship floats. When an object is partly or fully immersed in a liquid, the liquid exerts a force on the object. This force exerted is known as buoyant force or buoyancy.