7 വാതകങ്ങളിലെ താപീയവികാസം
THERMAL EXPANSION OF GASES
👉 When heated , do gases undergo the same changes as in solids and liquids?
Do gases also expand when heated ?
EXPERIMENT
Materials required :
An Aluminium lamp, a plastic tube, a board , coloured water , hot water.
Procedure :
Fix the plastic tube on the Aluminium lamp as shown in the figure. Fix the remaining part of the tube in 'U' shape on a board. Pour two or three drops of coloured water into the plastic tube. Place the Aluminium lamp in hot water and observe it. Then place the Aluminium lamp in cold water. observe it.
Observation :
When placed in hot water the coloured water in the tube move upwards. When placed in cold water the coloured water in the tube moves back and reach its initial position .
Inference :
When the Aluminium lamp becomes hot ,the air inside it also becomes hot. As this hot air expands ,the coloured water in the tube moves upwards.
As the Aluminium lamp cools down, the air contracts ,causing the coloured water to move back in the tube and reach its initial position.
നിഗമനം
അലുമിനിയം വിളക്ക് ചൂടാകുമ്പോൾ അതിനുള്ളിലെ ചൂടായ വായു വികസിക്കുന്നതുകൊണ്ടാണ് ട്യൂബിലെ നിറമുള്ള ജലം മുകളിലേക്ക് നീങ്ങുന്നത്. അലുമിനിയം വിളക്ക് തണുക്കുമ്പോൾ സങ്കോചിക്കുന്നതിനാൽ നിറമുള്ള ജലത്തുള്ളികൾ ട്യൂബിലൂടെ പിന്നിലേക്ക് നീങ്ങി പൂർവ്വ സ്ഥാനത്തെത്തുന്നു.
👉Thermal Expansion of Gases?
Gases expand on heating and contracts on cooling.
👉Temperature ?
Temperature is the term that indicates the degree of hotness. The units used to indicate temperature are degrees Celsius (o C) and degrees Fahrenheit
(o F). International unit (SI unit ) of temperature is Kelvin (K).
👉Which instrument is used to measure body temperature at a hospital ?
A clinical thermometer is used to measure body temperature. Normal temperature of human body is 37 oC ( 98. 6 o F)
👉Which instrument is used in a laboratory to measure temperature ?
Laboratory thermometer
👉If soil and water are placed under sunlight at the same time, which one will get heated faster ?
Materials Required :
Two glass tumblers two laboratory thermometers, water, sand.
Procedure :
Take sand in one glass tumbler and water in another and check the temperature with a laboratory thermometer. Place both the glasses in the sun. Then measure the temperature of sand and water with a thermometer at an interval of 20 minutes and record it. And then move both the glasses from the sun to a shade. Measure and record the temperature at an interval of 20 minutes.
Observation :
Sand is heated faster than water when placed in sunlight. Sand cooled faster than water when placed in the shade.
Inference :
Sand gets heated and cooled faster than water.
👉Sea Breeze (കടൽക്കാറ്റ് )
Then land is warmed than the sea during the daytime. The air just above the land gets heated. The air expands and rises up The air over the sea is cooler compared to that over the land. As the warm air over the land rises up, the cold air over the sea moves towards this place. Thus sea breeze is formed
👉Land Breeze( കരക്കാറ്റ് )
land cools faster than the sea. So, the air over the sea is relatively warmer. Therefore it will be the air above the sea that is more expanded. Then the cold air above the land flows towards the sea. This causes the land breeze.
👉കരക്കാറ്റ്
കടലിനെക്കാൾ വേഗത്തിൽ കര തണുക്കുന്നു. അതിനാൽ കടലിന് മുകളിലുള്ള വായുവിന് താരതമ്യേന ചൂട് കൂടുതലാണ്. അതിനാൽ കടലിന് മുകളിലെ വായുവാകും കൂടുതൽ വികസിച്ചിരിക്കുക. അപ്പോൾ കരയുടെ മുകളിലുള്ള തണുത്ത വായു കടലിലേക്ക് പ്രവഹിക്കുന്നു. ഇത് കരക്കാറ്റിന് കാരണമാകുന്നു.
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