Get premium membership and access questions with answers, video lessons as well as revision papers.

Describe experiments to show convention in gases; model chimney (smoke box) and revolving paper-vane experiments

Describe experiments to show convention in gases; model chimney (smoke box) and revolving paper-vane experiments.

Answers

(a) Experiment: model chimney (smoke box)

Procedure:
1. Obtain a model chimney system or construct one as shown
2. Place a lighted candle under one of the chimneys
3. Place a smouldering cloth near the other chimney and observe what happens.

Discussion:
Smoke will be seen going into the chimney and coming out through the other chimney. The air above the candle gets heated and rises up the chimney causing convectional currents which carry the smoke out with them.

(b) Experiment: revolving paper-vane

Procedure:
1. Make a paper-vane by cutting a thin card as shown
2. Put a string through the hole in the centre and hold it above a lighted Bunsen burner.
3. Observe what happens.

Discussion:
As the air above the flame gets heated convectional currents are formed and rise upwards.as these currents brush against the paper-vane it rotates.

---

raphael answered the question on October 11, 2018 at 05:21

Next: Describe an experiment comparing thermal conductivity of metals
Previous: Describe experiments to demonstrate convection in liquids; heating water in a beaker and model of hot water system experiment

View More Physics Questions and Answers | Return to Questions Index

Related Questions

• Describe an experiment comparing thermal conductivity of metals(Solved)
  

  Describe an experiment comparing thermal conductivity of metals.

  Date posted: October 11, 2018.  Answers (1)

• Describe the unusual expansion of water, with aid of diagrams(Solved)
  

  Describe the unusual expansion of water, with aid of diagrams.

  Date posted: October 11, 2018.  Answers (1)

• Describe with aid of diagrams 5 types of thermometers(Solved)
  

  Describe with aid of diagrams 5 types of thermometers

  Date posted: October 11, 2018.  Answers (1)

• Describe an experiment to show expansion of gases(Solved)
  

  Describe an experiment to show expansion of gases

  Date posted: October 11, 2018.  Answers (1)

• Describe the applications of the expansion of solids(Solved)
  

  Describe the applications of the expansion of solids.

  Date posted: October 9, 2018.  Answers (1)

• Describe the experiment to investigate actual expansion of solids, using a bimetallic strip(Solved)
  

  Describe the experiment to investigate actual expansion of solids, using a bimetallic strip.

  Date posted: October 9, 2018.  Answers (1)

• Describe the bar-breaker experiment(Solved)
  

  Describe the bar-breaker experiment.

  Date posted: October 9, 2018.  Answers (1)

• Describe the ball and ring experiment(Solved)
  

  Describe the ball and ring experiment.

  Date posted: October 9, 2018.  Answers (1)

• Outline ways in which matter can be changed(Solved)
  

  Outline ways in which matter can be changed.

  Date posted: October 9, 2018.  Answers (1)

• Application of pressure in gases and liquids(Solved)
  

  Application of pressure in gases and liquids.

  Date posted: October 9, 2018.  Answers (1)

• With the aid of diagrams, describe four devices used in measuring pressure(Solved)
  

  With the aid of diagrams, describe four devices used in measuring pressure

  Date posted: October 9, 2018.  Answers (1)

• A man blows into one end of a U-tube containing water until the levels differ by 40.0 cm. if the atmospheric pressure is 1.01 ×...(Solved)
  

  A man blows into one end of a U-tube containing water until the levels differ by 40.0 cm. if the atmospheric pressure is 1.01 × 105 N/m² and the density of water is 1000 kg/m³, calculate his lung pressure.

  Date posted: October 9, 2018.  Answers (1)

• The height of the mercury column in a barometer is found to be 67.0 cm at a certain place. What would be the height of...(Solved)
  

  The height of the mercury column in a barometer is found to be 67.0 cm at a certain place. What would be the height of a water barometer at the same place? (Densities of mercury and water are 1.36 × 104 kg/m³ and 1.0 × 103 kg/m³ respectively.)

  Date posted: October 9, 2018.  Answers (1)

• A diver is 10 m below the surface of water in a dam. If the density of water is 1,000 kgm^-3, determine the pressure due...(Solved)
  

  A diver is 10 m below the surface of water in a dam. If the density of water is 1,000 kgm^-3, determine the pressure due to the water on the diver. (Take g = 10 Nkg )

  Date posted: October 9, 2018.  Answers (1)

• A rectangular brick of weight 10 N, measures 50 cm × 30 cm × 10 cm. calculate the values of the maximum and minimum pressures...(Solved)
  

  A rectangular brick of weight 10 N, measures 50 cm × 30 cm × 10 cm. calculate the values of the maximum and minimum pressures which the block exert when resting on a horizontal table.

  Date posted: October 9, 2018.  Answers (1)

• The length of a spring is 16.0 cm. its length becomes 20.0 cm when supporting a weight of 5.0 N. calculate the length of the...(Solved)
  

  The length of a spring is 16.0 cm. its length becomes 20.0 cm when supporting a weight of 5.0 N. calculate the length of the spring when supporting a weight of: (a) 2.5 N (b) 6.0 N (c) 200 N

  Date posted: October 9, 2018.  Answers (1)

• Outline the types of forces(Solved)
  

  Outline the types of forces

  Date posted: October 9, 2018.  Answers (1)

• State three properties of gamma rays which differ from that of alpha and beta particles(Solved)
  

  State three properties of gamma rays which differ from that of alpha and beta particles.

  Date posted: September 20, 2018.  Answers (1)

• The speed of sound in air is 340 m/s.A loudspeaker placed between two walls X and Y, but nearer to wall x than wall y,...(Solved)
  

  The speed of sound in air is 340 m/s.A loudspeaker placed between two walls X and Y, but nearer to wall x than wall y, is sending out constant sound pulses.How far is the speaker from wall Y if it is 200 m from wall X and the time between the two echoes received is 0.176 s.

  Date posted: September 17, 2018.  Answers (1)

• The ship sends out an ultrasound whose echo is received after 10s. If the wavelength of the ultrasound in water is 0.05 m and the...(Solved)
  

  The ship sends out an ultrasound whose echo is received after 10s. If the wavelength of the ultrasound in water is 0.05m and the frequency of the transmitter is 50kHz, calculate the depth of the ocean

  Date posted: September 17, 2018.  Answers (1)