Pendulum clocks become slow in summer because

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Q: 73 (UPPSC/2012)
Pendulum clocks become slow in summer because

question_subject: 

Science

question_exam: 

UPPSC

stats: 

0,26,17,6,9,26,2

keywords: 

{'pendulum changes': [0, 0, 0, 1], 'pendulum increases': [0, 0, 0, 1], 'pendulum clocks': [0, 0, 0, 1], 'summer': [1, 0, 0, 0], 'coil': [0, 0, 1, 1], 'friction': [0, 0, 1, 1]}