Mr Sanjai Santos

Topics: Fog, Water vapor, Precipitation Pages: 29 (9841 words) Published: May 20, 2014
Meteorological Phenomena
1) The dipping duck
2) Galileo's thermometer
3 Light engine
4) Willy-willy
5) Dust Storm
6) Cloud Colour
7) Global dimming
8) Temperature Inversions
9) Sun Halo
10) Water Evaporates below Boiling Point
11) Why sky is blue below 30km & black above
12) Why is temperature max reached after noon
13) Fog (glasses question)

14) Ozone hole in spring
15) What makes mountains in distance appear blue
16) Temperature range with latitude
17) When there is dew, there is no rain (dew & frost)
18) Eye of the cyclone
19) Jet Streams
20) Upwelling
21) Wind and Temperature
22) The Dishpan Experiment
23) Why do the trade winds flow from the northeast and southeast instead of directly from the east?

24) What is the Hadley cell and where is it found
25) As Height Increases, Pressure Decreases
26) Cloud bases are horizontal while tops are rounded
27) Colour of stars is related to their temperature, but colour of planets is not 28) Continental Air masses are colder than maritime air masses 29) Walker Circulation

30) Southern Oscillation Index

31) Coriolis Effect

32) Wreck of the Hesperus

33) Ekman spiral

34) Latent Heat

36) Why do hot and humid summer days feel hotter than hot and dry summer days even though the temperature is the same?

37) The West-Australian coast near Perth runs effectively north-south yet Perth experiences a south-westerly sea breeze rather than a westerly breeze

38) Leeuwin Current & diff in sea level

39) South westerly wind & its effect on WA currents/ why winter is mild

40) Balloon movement

41) Why sea breezes occur

1) The dipping duck:

The duck is composed of two spherical cavities joined by a tube which starts in the neck of the puppet and goes on inside the lower cavity quite until the bottom. The object can rotate on a horizontal axis set about in the middle of the cavities. The lower cavity contains a very volatile liquid with a tension of steam which is strongly correlated with temperature; the higher cavity, the "head" of the duck, is coated by felt that can absorb water.


If the head of the duck is dry, all of the coloured liquid remains in the lower cavity: centre of mass of the system is in this case under the axis of rotation. The result is that the weight produces a couple that trends to bring the duck back in the vertical position of stable equilibrium. If you wet the felt that coats the head, you observe that the coloured liquid starts rising on the neck. Because of this rising, the centre of mass of the duck goes up, until it is over the axis of rotation. At this point the twisting force due to the weight makes the duck incline to the bottom. Finally, when the beak beats the glass, the tube is so inclined thus it doesn't draw in the lower cavity. Consequentially the liquid immediately goes down and the duck returns to the vertical position. We want also to understand why suddenly the liquid starts rising. The explanation is very simple: due to the evaporation of the water, that wets the felt, the temperature of the head decrease. Then the head reaches a lower pressure than the cavity at the bottom and so the higher pressure in the cavity pushes up the liquid. A curiosity: we don't need the water in the glass (it is only a "special effect"), in fact it is enough to wet head. Before the head is completely dry, a lot of time has passed and we can observe the duck going up and down many times.

2) Galileo's thermometer

The device is constituted by glass cylinder containing a liquid with a density that considerably increases on decreasing of the temperature. Within the cylinder there are some glass cruets with a coloured liquid inside. These cruets have different average densities and bring name-plates where one can read the temperature. Explanation

When the device has reached the thermodynamic equilibrium with the external...
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