Weather

What is weather?

• The amount of moisture in the air

• The number of clouds in the sky

• The speed of the wind

• The state of the atmosphere at any particular time.

Why is the temperature lower at night than during the day?

• There are more clouds at night to block the sun's rays

• Winds blow harder at night

• The temperature depends on energy from the sun

• There is less water in the air at night

Which of the following devices measures air pressure?

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If it's a hot day outside, what can you conclude?

• There are a lot of clouds in the sky

• The air can hold a lot of moisture

• The wind is blowing extremely fast

• The air can hold very little moisture

Why can't you see the water vapor in the air?

• It exists as a clear, colorless gas

• It's all been condensed

• There is very little of it

• It's all far away, in the upper atmosphere

What is the difference between absolute humidity and relative humidity?

• Absolute humidity represents how much water the air actually holds; relative humidity is how much water the air can hold

• Relative humidity makes the air sticky; absolute humidity makes the air dry

• Absolute humidity is how much water the air can hold; relative humidity represents how much water the air actually holds

• Absolute humidity is expressed as a percentage; relative humidity is expressed as a whole number

Why does it tend to be cool at the Earth's poles?

• They are farthest from the sun

• They have high absolute humidity

• They have the worst weather

• Sunlight strikes them at extreme angles

What are the characteristics of a high-pressure system?

• Wind and rain

• Humidity and thunder

• Extremely hot temperatures

• Clear skies and sun

If the air is only holding one-third as much moisture as it can possibly hold, what is the relative humidity?

• 25 percent

• 50 percent

• 33 percent

• 67 percent

What will happen if the relative humidity is 100 percent, and the temperature begins falling?

• It will start to rain

• The air will be sticky and uncomfortable

• The temperature will rise

• The barometric pressure will rise