WebbClass 7th Science Class 7 Science NCERT Notes PDF Download (Handwritten & Short Notes) FREE PDF Download 1 Ch 01 Nutrients in Plants 2 Ch 02 Nutrients in Animals 3 Ch 03 Fibre to Fabric 4 Ch 04 Heat 5 Ch 05 Acids Bases and Salts 6 Ch 06 Physical and Chemical Changes 7 Ch 07 Weather, Climate and Adaptations of Animals To Climate Webb1. Define the ignition temperature of a substance. Answer The lowest temperature at which a combustible substance catches fire when heated in the air is called its ignition temperature of a substance. 2. Which of the two has a lower ignition temperature: petrol or kerosene? Answer Petrol has a lower ignition temperature. 3.
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