Important points to remember :
1. Force :
Force is required to ( 1 ) move a stationary object ( 2 ) stop a moving object ( 3 ) change the velocity and speed of an object ( 4 ) change the size and shape of an object.
Pressure :
The force applied on unit area is called pressure.
Pressure = force/area
The unit of pressure is the newton per square metre ( N / m^2 )
Pressure affects substances in the solid state, liquid state, as well as the gaseous state.
A fluid substance exerts equal pressure in all directions.
A fluid flows from a region of higher pressure to a region of lower pressure.
The pressure exerted by the atmosphere is term as atmospheric pressure.
The working of a pump, a spray pump, etc., is based on atmospheric pressure.
Important points to remember :
1. Force :
Force is required to ( 1 ) move a stationary object ( 2 ) stop a moving object ( 3 ) change the velocity and speed of an object ( 4 ) change the size and shape of an object.
Pressure :
The force applied on unit area is called pressure.
Pressure = force/area
The unit of pressure is the newton per square metre ( N / m^2 )
Pressure affects substances in the solid state, liquid state, as well as the gaseous state.
A fluid substance exerts equal pressure in all directions.
A fluid flows from a region of higher pressure to a region of lower pressure.
The pressure exerted by the atmosphere is term as atmospheric pressure.
The working of a pump, a spray pump, etc., is based on atmospheric pressure.
See then.....
1. After sunset, the land near the sea gets cooled faster and to a great extent as compared to the sea water.
Hence, the air over the land cools quickly. The sea water does not cool quickly.
Hence, the air over sea remains warm and rises. Therefore, the air pressure over the land becomes greater than that over the sea. As a result, a breeze from the land towards the sea is produced. This breeze is called a land breeze.
2. During day time, air over the land near the sea gets heated up faster and to a greater extent than the air over the sea. As a result, the warm air over the land becomes lighter and rises. Hence, the air pressure over the land becomes less. Hence, the air over the sea blows towards the lands. This breeze is called a sea breeze.
1. Fishes show great variety in their size. Some fishes are tiny while some are giant sized.
2. Some species of fish live in fresh water while some live in saline water.
3. Tail fin of some fish is used for changing directions while swimming, while some fish use the same as organ of defence.
4. Some fishes live for a long period of time as they have long life span, while others may have shorter life span.
These are variations seen in the body structure, habitat and life span of diffent fish.
1. Fishes show great variety in their size. Some fishes are tiny while some are giant sized.
2. Some species of fish live in fresh water while some live in saline water.
3. Tail fin of some fish is used for changing directions while swimming, while some fish use the same as organ of defence.
4. Some fishes live for a long period of time as they have long life span, while others may have shorter life span.
These are variations seen in the body structure, habitat and life span of diffent fish.
GaneshScience: lacrimal gland: Thelacrimal glandsare paired almond-shaped glands, one for each eye, that secrete the aqueous layer of the tearfilm. They are situated in t...
