Physics Gift Ideas Rotating Glass Windmill

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Sale Price:  US $21.99
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Physics Gift Ideas Rotating Glass Windmill

Physics Gift Ideas Rotating Glass Windmill

Physics gift ideas rotating glass windmill. This physical and technical miracle shows you in a clear way how sunlight is converted to energy.

Product Description:
Invented in 1873 by the chemist Sir William Crookes as the by-product of some chemical research, the radiometer is made from a glass bulb from which much of the air has been removed to form a partial vacuum. Inside the bulb, on a low friction spindle, is a rotor with several (usually four) vertical lightweight metal vanes spaced equally around the axis. The vanes are polished or white on one side and black on the other. When exposed to sunlight, artificial light, or infrared radiation (even the heat of a hand nearby can be enough), the vanes turn with no apparent motive power, the dark sides retreating from the radiation source and the light sides advancing. Just place near a window or under a direct incandescent light as the vanes only rotates in light (sunlight or incandescent light). The more light shine on the globe the faster the vanes rotates.

Specification:
Material: Glass
Color: Clear
Base Size: 80mm/3.1″
Height: 205mm/8.1″
Sphere diameter: 90mm/3.5″

Package Included:
1 x Crookes Radiometer

Features:
? Magnificent Glass Radiometer, makes a great gift for the one who have everything.
? All made of glass. Globe is 3.5 inch in diameter and stands 8 inch tall.
? This physical and technical miracle shows you in a clear way how sunlight is converted to energy.
? Place near a window or under incandescent light and watch as the vanes rotate.

Notice:
1.Please allow 1-3mm error due to manual measurement.Pls make sure you do not mind before you bid.
2.The color may have different as the difference display,pls understand.

 

Physics Gift Ideas Rotating Glass Windmill

Physics Gift Ideas Rotating Glass Windmill

Physics Gift Ideas Rotating Glass Windmill

 

Shipping 

1. We usually ship the package by China post air mail to most countries or ePacket to USA, which will arrive    within 15-60 working days after being posted. But if you purchase more than USD300.00 on products ,we will ship by DHL or EMS free which arrive within 3-12days. 
2. We do not be responsible for any customs duty or import tax.
3. We will deliver the items to your Aliexpress adress, so please confirm your adress before you place the order. And due to the policy of Russian Post, customers from Russian Federation please write your full name so that you can get the order.
4.Sometimes due to the customs or weather problem, it will be delayed more days up to 35-58 days. To Brazil, it will be slower, sometimes will be more than 70 days.

 

Customer service

       1. Any enquiries will be replied within 24 hours

        2. ODM/OEM available and packaging according to your design

        3. We usually deliver the goods within 7 days after you place the order. If you have any problem on the mail, please contact us asp.

        4. Regardless of the minor desparity between the material object  and photos due to the shooting light and angles, if you find that the goods are not in accordance with the pictures we show and describe or you are not satisfied with it, you can return it in original condition within 7 days as soon as you receive the product. But the shipping fee should be paid by the buyer.

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Shipping Company Shipping Cost Estimated Delivery Time
DHL 3 - 7 days
UPS Expedited 3 - 7 days
EMS 5 - 14 days
Post Air Mail Free Shipping 15 - 45 days
Return Policy If the product you receive is not as described or low quality, the seller promises that you may return it before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe) and receive a full refund. The return shipping fee will be paid by you. Or, you can choose to keep the product and agree the refund amount directly with the seller.

N.B.: If the seller provides the "Longer Protection" service on this product, you may ask for refund up to 15 days after order completion.
Seller Service On-time DeliveryIf you do not receive your purchase within 60 days, you can ask for a full refund before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe).

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Price: 
Sale Price:  US $21.99
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