Weather

What is weather?

• The state of the atmosphere at a particular time

• The amount of moisture in the air

• The number of clouds in the sky

• The speed of wind

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

• There is less water in the air at night

• The temperature depends on energy from the sun

• Winds blow harder at night

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

What type of device/tool is used to measure air pressure?

• Thermometer

• Barometer

• Wind vane

• Wind sock

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

• The wind is blowing extremely fast

• The air can hold very little moisture

• There are a lot of clouds in the sky

• The air can hold a lot of moisture

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

• There is very little of it

• It exists as a clear colorless gas

• It's all far away in the upper atmosphere

• It has all been condensed

What is the difference between absolute humidity and relative humidity?

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

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

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

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

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

• They have the worst weather

• They are furthest from the sun

• Sunlight strikes them at extreme angles

• They have high absolute humidity

What are the characteristics of a high-pressure system?

• Wind and rain

• Clear skies and sun

• Humidity and thunder

• Extreme hot temperatures

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

• 50%

• 25%

• 33%

• 67%

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

• The air will be sticky and uncomfortable

• It will start to rain

• The temperature will rise

• The barometric pressure will rise