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USB Microscopes - Be afraid be very afraid

Once the domain of serious professionals wearing white coats and working in laboratories, USB Microscopes have fallen in price dramatically and are now genuinely affordable gadgets.

Incredibly easy to use (and addictive) the USB Microscope will give you a close up view of whatever you put in its path, be that skin tissue, insects, strands of hair, stamps, mould and so on. With a magnification of up to x200 (and newer models of x400) you’re able to gather images of remarkable clarity.

The definition if the images is helped by the built in LED light that illuminates the subject and just like using a digital camera the images from the microscope can be captured and then used in documents, posted to web sites or emailed to friends and colleagues.

Most (not all) USB Microscopes will come with a stand that makes it easier to use in some situations. But, the microscopes are not much bigger than a large pen so they are light and easy to handle – not for the fainthearted but one use is the “search for head lice” on children with the images of little blighters shown in start and shocking detail on your PC screen as you move the microscope over the child’s head.

The USB Microscope really is a highly sophisticated bit of kit with loads of serious applications for students, collectors and hobbyists. Use it to examine precious jewellery, watches, banknotes, fabrics, food - the possibilities are endless.

The bundled software aids easy capture and manipulation of any images you gather and with some basic PC editing skills you’ll soon be able to impress your friends with your new view on the world around you.

Take care if you get one for the office because they are addictive and it’s easy to burn though hours just playing with them!

About the Author

Phil is part of the team at USBNow. Launched in 2002 USBNow specializes in all things USB related. If you are looking for helpful advice on your USB related problems or you’re interested in the latest USB products be sure to check us out at http://www.usbnow.co.uk

I need professional help on this physics question.?

Consider an equal mass of water at liquid state and water vapour both at the same temperature (say 300K).
Is the internal energy of the water at liquid state higher than the internal energy of water vapour of the same temperature?
I need clear justification on this.
All i know is, internal energy of a system is defined as the sum of microscope KE and PE of the molecules in the system.
In gas such as water vapour, intermolecular forces of attraction is weak and hence it has low PE.(correct me if i'm wrong)
Since they are at the same temperature, both systems have the same KE?
So my conclusion is water in liquid is at a higher energy state. I'm very skeptical about this conclusion. A gas should be at a higher energy state....

It's good to see people actually thinking about what the terms they're using mean, rather than just plugging them into equations.

Basically, the place where you seem to be confused is here:

"In gas such as water vapour, intermolecular forces of attraction is weak and hence it has low PE"

Actually, this means the exact opposite, that the system has very high potential energy. Think about gravity for a minute - if a rock placed at, say, 1 foot above the ground were to fall to Earth, it would not release very much energy. Conversely, if the rock were placed 1 mile above the Earth, it would release a considerable amount of energy. The higher the rock is, the greater it's potential energy. However, the further the rock is away from Earth, the weaker the force of gravity acting on it - thus weak gravitational attraction corresponds to higher potential energy. Similarly with the particles in a gas - if they were to "fall" into a partially bound state such as that of a liquid, they would release energy, and thus the unbound state where the particles are too far away from each other to form bonds is the higher energy state.

This is not to say that a weaker force always corresponds to a higher energy state - if the reason that the force is weaker is that there is less mass/charge/whatever producing it, that really will lower the potential energy. But in the transition from a liquid to a gas does not change the charge of any of the particles - the reduction in intermolecular forces comes from the fact that the particles are moving out of each other's electrical potential wells, a process which, just like lifting up a rock, raises the potential energy.

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