Question

D Give one word for each of the following.
1. This is equal to one newton per square metre
2. Force per unit area
3. The pressure exerted by the weight of the air on an object on the Earth
4. A device used to measure atmospheric pressure
5. Liquids and gases are collectively called​

Answer 1

Answer:

1. 1 Pascal

2. pressure is defined as force per unit area

3. atmospheric pressure

4. Barometers

5. fluids

Answer 2

Required Answer:

Give one word :-

• 1. This is equal to one newton per square metre : Pascal

$\longmapsto$ According to the question we have to find which one is equal to 1N/m² or N/m². So, as we know that the SI unit of pressure is Pascal and ,

$\sf {\longmapsto Pressure = \dfrac{Force}{Area} }$

If we write it in SI units ,then :

$\sf {\longmapsto Pa = \dfrac{N}{{m}^{2}} }$

[SI unit of force is Newton (N) and si unit of area is m².]

$\sf \red {\longmapsto Pa = N/{m}^{2} }$

Thus, Pascal is equal to one newton per square metre.

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• 2. Force per unit area : Pressure

⇒ Pressure is defined as force applied per unit area.

⇒ $\sf { Pressure = \dfrac{Force}{Area} }$

⠀⠀• If area is less pressure will be more.⠀

⠀⠀• If area is more pressure will be less.⠀

⠀⠀• If force is more pressure will be more.

⠀

⇒ SI unit of Pressure is Pascal (Pa).

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• 3. The pressure exerted by the weight of the air on an object on the Earth : Atmospheric pressure

⇒ Atmospheric pressure is defined as the pressure exerted by the weight of the air on an object on the Earth.

⇒When the altitude increases, atmospheric pressure decreases.

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• 4. A device used to measure atmospheric pressure : Barometer

⇒ Barometer is used to measure atmospheric pressure.

⇒Measure of the atmospheric pressure is taken through its height of the level .

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• 5. Liquids and gases are collectively called : Fluids

→ Liquids and gases together known as fluids.

→ Fluids have weight and can flow & it can transmit pressure.

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