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Cat B- Mod 2 Physics > 2.2.4 Fluid Dynamics > Flashcards

2.2.4 Fluid Dynamics Flashcards

1
Q

What is density?

A

How closely packed particles are in a solid, liquid or gas.

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2
Q

What is the formula for density?

A

mass x volume

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3
Q

To convert density from kg/m³ to g/cm³?

A

Divide by 1000

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4
Q

What is SG?

A

Specific gravity

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5
Q

What is specific gravity?

A

Relative density, used to compare densities of two substances.

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6
Q

How are the densities of liquids and solids compared?

A

Compared with water at 4 degrees.

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7
Q

How are the densities of gasses compared?

A

Compared with air at room temp.

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8
Q

What is the unit for SG?

A

There isn’t one as it is a ratio.

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9
Q

What can the SG of liquids be measured with?

A

A hydrometer.

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10
Q

What is viscosity?

A

Resistance of a fluid to change in shape.

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11
Q

What viscosity do cold heavy oils have?

A

High viscosity.

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12
Q

What happens to the viscosity of liquids as the temperature increases?

A

Decreases.

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13
Q

What happens to the viscosity of gases as the temperature increases?

A

Increases.

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14
Q

What is fluid resistance?

A

Resistance to motion in a fluid when a solid travels through a gas or liquid.

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15
Q

What determines the resistance on a fluid?

A

Viscosity
Surface texture
Shape of object

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16
Q

What is the speed of sound at sea level?

A

340m/s

17
Q

What is ISA?

A

International standard atmosphere

18
Q

If a liquid is compressible, what would happen when the pressure is increased?

A

Raise temp, lower viscosity, increase velocity.

19
Q

What is pascals law?

A

When pressure is applied to a liquid in a container, it exerts pressure at right angles.

20
Q

What is static pressure?

A

It exists in addition to any dynamic factors that are already there.

21
Q

What is dynamic pressure?

A

The pressure that emerges from velocity of fluid in motion.

22
Q

What is total pressure?

A

The sum of dynamic and static pressure.

23
Q

Which type of pressure does pascals law apply too?

A

Static

24
Q

What is Bernoulli’s theorem?

A

When energy is neither added or taken from a fluid in motion, the potential energy and pressure decrease when the kinetic and velocity increase.

25
Q

What did Bernoulli realise?

A

The potential energy is created by the fluids pressure, whereas the kinetic energy is caused by the fluids movement.

26
Q
A

Cat B- Mod 2 Physics (9 decks)

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