In text questions page number 9 Chapter 1: Matter in Our Surrounding Science Class 9 solutions are avalable at ourwebsite to help the students. In text questions page number 9 is solved by our expert teachers. You can get ncert solutions and notes for class 9 chapter 1 absolutely free. NCERT Solutions for class 9 Science Chapter 1: Matter in Our Surrounding will definitely help in improving your marks in CBSE Board examinations.
In text questions page number 9
Question1. Convert the following temperature to Celsius scale: a. 300 K b. 573 K.
Answer: To concert Kelvin scale into Celsius scale we have to subtract 273 so (a) 300K=300-273=27 ºC, (b) 573K=573-273=300 ºC
Question 2. What is the physical state of water at: a. 250ºC, b. 100ºC?
Answer: (a) At 250ºC water exist in only gaseous state. (b) At 100ºC water exist in both gaseous and liquid state.
Quesiton 3. For any substance, why does the temperature remain constant during the change of state?
Answer: The temperature remain constant during the change of state because the heat supplied is used up in changing the state of matter as it has to work against the force of attraction of molecules.
Question 4. Suggest a method to liquefy atmospheric gases.
Answer: The gases can be converted into liquids by bringing its particles closer so atmospheric gases can be liquefied either by decreasing temperature or by increasing pressure.
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