किस प्रक्रिया से लालटेन या लैम्प की बत्ती से तेल ऊपर चढ़ता है? By which process the oil in the lamp's string moves upward?

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किस प्रक्रिया से लालटेन या लैम्प की बत्ती से तेल ऊपर चढ़ता है? By which process the oil in the lamp's string moves upward?