It is sometimes more difficult to get airplanes off the ground in extremely hot weather. But the problem is not the temperature itself or the humidity. It is the air density that can get in the way. Hotter air gets thinner. Thin air makes it more difficult for planes to lift and land safely. This is especially the case with smaller planes. That is why more than 50 flights were canceled in the southwestern United States earlier this week. Temperatures there have climbed to 49 degrees Celsius. Airplanes take off and stay in the air because of lift -- the force from the movement of air under the plane’s wings that push it upward.
Title: Why Can’t Some Planes Fly in Hot Weather?
Content: <div id='article-page'><div id='article-content' data-media-url='//news-app-staging.s3.amazonaws.com' data-base-url='//news-app-staging.herokuapp.com' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/hot_plane.m4a' data-capture-url='//staging.analytics.lingraphica.com/events/capture_news' data-article-title='Why Cant Some Planes Fly in Hot Weather?' data-article-id='2456'><script src='//news-app-staging.herokuapp.com/javascripts/getscripts.js'></script><link rel='stylesheet' href='//news-app-staging.herokuapp.com/stylesheets/article.css' type='text/css' /><div class='article'><p><span data-start-time='0' data-end-time='8500'>It is sometimes more difficult to get airplanes off the ground in extremely hot weather.</span> <span data-start-time='8500' data-end-time='15146'>But the problem is not the temperature itself or the humidity.</span> <span data-start-time='15146' data-end-time='20500'>It is the air density that can get in the way.</span> <span data-start-time='20500' data-end-time='23875'>Hotter air gets thinner.</span> <span data-start-time='23875' data-end-time='31125'>Thin air makes it more difficult for planes to lift and land safely.</span> <span data-start-time='31125' data-end-time='36958'>This is especially the case with smaller planes.</span> <span data-start-time='36958' data-end-time='46438'>That is why more than 50 flights were canceled in the southwestern United States earlier this week.</span> <span data-start-time='46438' data-end-time='52854'>Temperatures there have climbed to 49 degrees Celsius.</span> <span data-start-time='52854' data-end-time='67333'>Airplanes take off and stay in the air because of lift -- the force from the movement of air under the plane’s wings that push it upward.</span> </p></div><div class='control-buttons-sticky' style='display:none;'><div class='control-buttons'><button title='Back' class='back' disabled='disabled'></button><button title='Play' class='play' disabled='disabled'></button><button title='Pause' class='pause' style='display:none;'></button><button title='Forward' class='forward' disabled='disabled'></button><button class='finished-reading' style='display:none;'>Done</button></div></div></div><div id='article-media'><div id='media-image'><img src='https://news-app-production.s3.amazonaws.com/articles/1939/hot_planes.jpg'/></div></div><div id='question-content' style='display:none;'><div class='vocabulary_question question-container' data-question-id=8872 data-hint-location='23875' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/what_does_lift_mean.m4a'>What does lift mean?</div><div class='choices' data-correct-choice='boost'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/land.m4a'><span>land</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/boost.m4a'><span>boost</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/heat.m4a'><span>heat</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/fly.m4a'><span>fly</span></div></div></div><div class='multiple_choice_question question-container' data-question-id=8873 data-hint-location='15146' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/what_causes_the_problem.m4a'>What causes the problem?</div><div class='choices' data-correct-choice='density'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/density.m4a'><span>density</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/lift.m4a'><span>lift</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/temperature.m4a'><span>temperature</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/humidity.m4a'><span>humidity</span></div></div></div><div class='sentence_completion_question question-container' data-question-id=8874 data-hint-location='20500' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/hotter_air_gets__blank_.m4a'>Hotter air gets <span class='blank'>thinner</span>.</div><div class='choices' data-correct-choice='thinner'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/less_humid.m4a'><span>less humid</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/more_lift.m4a'><span>more lift</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/thinner.m4a'><span>thinner</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/denser.m4a'><span>denser</span></div></div></div><div class='question-buttons'><button class='skip-button'></button><button class='hint-button'></button><button class='speak-button'></button></div></div></div>
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