Isobar & Isotherms/DP & Hum

Base your answer to the following question on the graph below. The graph shows air temperature and relative humidity at a single location during a 24-hour period.

What was the approximate change in relative humidity from 12 noon to 4 p.m.?

• 10%

• 15%

• 20%

• 30%

Tags

NGSS.MS-ESS2-5

The data table below shows the dry-bulb and wet-bulb temperatures measured with a psychrometer on four different days at the same location.

According to the data shown in the table, which day had the highest relative humidity?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-ESS2-5

What is an isotherm? 

• A line on a weather map that connects points of equal air temperature
•  A line on a weather map that connects points of equal air pressure
• A pattern of weather that shows cloudy skies and precipitation
• A pattern of weather that brings clear skies and warm temperatures 

Tags

NGSS.MS-ESS2-5

Use the picture or your sheet, what is the dew point if the dry-bulb temperature is 16° and the difference is 5° between wet-bulb and dry-bulb?

• 16°

• 5°

• 11°

• 7°

Use your sheet or this picture, what is the relative humidity if the dry-bulb temperature is 6° and the difference between wet-bulb and dry bulb is 2°?

• 6%

• 72%

• 4%

• 46%

What instrument is used to measure dewpoint and relative humidity?

• Thermometer

• sling psychrometer

• wind vane

• Barometer

Widely spaced isobars indicate:

• strong pressure gradient and strong winds

• weak pressure gradient and weak winds

• strong pressure gradient and weak winds

• weak pressure gradient and strong winds

Tags

NGSS.MS-ESS2-5

The weather maps show the eastern United States on two consecutive days. Some isobars are labeled in millibars (mb). Letter X represents a location on Earth’s surface on December 8, 2009. What was the barometric pressure for location X on December 8?

• 1016 mb

• 1012 mb

• 1008 mb

• 1004 mb

Tags

NGSS.MS-ESS2-5

What is the difference between an isotherm and an isobar?

• An isotherm shows air pressure and an isobar shows temperature 

• They both show types of precipitation you can expect in your area 

• An isotherm shows temperature and an isobar shows air pressure

• A high pressure area will bring nice weather while a low pressure area brings storms 

What is the standard interval or spacing between isobars? 

• 2
• 4
• 5
• 10