Hewitt-Drew-it! 81. Thermodynamics

The three laws of thermodynamics are cited and explained.

 

Hewitt-Drew-it! 79. Energy of Phase Changes

The roles of heat of fusion, and vaporization, in changes in phase.

Why does ice float in water? - George Zaidan and Charles Morton

Water is a special substance for several reasons, and you may have noticed an important one right in your cold drink: ice. Solid ice floats in liquid water, which isn't true for most substances. But why? George Zaidan and Charles Morton explain the science behind how how hydrogen bonds keep the ice in your glass (and the polar ice caps) afloat.

 Lesson by George Zaidan and Charles Morton, animation by Powerhouse Animation Studios Inc.

 

Arrow of Time - Sixty Symbols

Sean Carroll on the arrow of time.
See all our videos with Sean: http://bit.ly/115AVqa
Sean's book about the arrow of time: http://amzn.to/16FzAt8

ScienceCasts: Strange Flames on the International Space Station

Researchers experimenting with flames onboard the International Space Station have produced a strange, cool-burning form of fire that could help improve the efficiency of auto engines.

 

Negative Temperatures are HOT - Sixty Symbols

Temperatures below absolute zero are HOTTER than those above, explains Professor Philip Moriarty.

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Bimetallic Strip

A bimetallic strip (12" ) of iron and aluminum is vertically fixed at one end to a board. The top end has a pointer that is free to move. The bimetallic strip is straight at room temperature. When heated with a blow torch, the strip curves due to differential expansion.

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Cryogenic Experiments on Passive and Active Electronic Components

In this episode, Shahriar investigates the theory and experimental results of the impact of extreme low temperatures on passive and active components. Liquid Nitrogen in used in a transparent glass Dewar where different components can be fully submerged in the liquid. Various types of resistors are compared for their temperature stability. An electromagnet which uses Copper coils is used to generate a magnetic field at a constant power consumption at both extreme temperatures. The impact of liquid nitrogen on the junction voltage of an NPN device is measured as well as the frequency shift of a CMOS ring oscillator. Finally, the wavelength shift of an LED submerged in liquid nitrogen is studied.

 

Kelvin - Sixty Symbols

The Kelvin temperature scale is linked to the concept of absolute zero.

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Fire Syringe

When air is compressed very quickly, it can reach high temperatures. In this demonstration we show how cotton wool can reach the point of auto-ignition by quick compression of air in the fire syringe.

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