SELECT * FROM question_mgmt as q WHERE id=3927 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=8 AND subId=16 AND chapterId=180 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 9th science Matter in Our Surroundings the mass per unit volume of a substance is called

Question:

The mass per unit volume of a substance is called density. (density = mass/volume). Arrange the following in order of increasing density – air, exhaust from chimneys, honey, water, chalk, cotton and iron.

Answer:

density = mass / volumes

Arranging substance in their increasing order of densities

Air < exhaust from chimneys < cotton < water < honey < chalk < iron.

Reason: (The most heavy will be the highest density.) Iron is heavy so there is more density and the air is light so its density is low. 

Density is a property of matter which tells about how tightly particles are packed in a given object.


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SELECT ex_no,question,question_no,id,chapter FROM question_mgmt as q WHERE courseId='8' AND subId='16' AND ex_no!=0 AND status=1 and id!=3927 ORDER BY last_viewed_on desc limit 0,10

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  • Answered by Ekta Mehta
  • 4 months ago

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