Crookes Radiometer

Crookes Radiometer Specification

Glass Type
Clear laboratory-grade glass

Shape
Spherical glass bulb mounted on a stand

Features
Rotates when exposed to sunlight or strong artificial light; sensitive to various light intensities; sealed vacuum bulb

Accuracy
Qualitative demonstration (not quantitative instrument)

Power Supply
Solar/Light powered

Temperature Resistance
Standard room temperatures; avoid exposure to extremes

Control Type
None (automatic via light exposure)

Speed Range
Vane speed varies with light intensity (no fixed range)

Type
Crookes Radiometer

Dimension (L*W*H)
Approx. 14 cm (Height) x 7 cm (Diameter)

Equipment Type
Physics Laboratory Demonstration Equipment

Equipment Materials
Glass bulb with metal vane assembly

Power
Operates via light energy (no external power required)

Material
Superior quality glass and lightweight metal vanes

Application
Demonstration of light energy conversion, physics education, science laboratory, optical experiments

Packaging
Individual carton box with protective padding

Colour
Transparent glass bulb; black and white vanes

Mounting Style
Stand-mounted for tabletop use

Weight
Lightweight (Approx. 100 grams)

Maintenance
Dust with soft cloth, handle glass with care

Vacuum Level
Partially evacuated bulb

Usage Environment
Classroom, laboratory, educational display

Operation Principle
Radiometric effect (light-momentum-induced rotation) in partial vacuum

Vane Material
Lightweight metal (typically aluminum or tin)

Number of Vanes
Four (2 black, 2 white)

About Crookes Radiometer

Convert light into motion and demonstrate radiant heat. This device has a rotating shaft supporting two vanes, mounted in an evacuated glass bulb. One side of each vane is black, the other shiny silver. High light levels cause the vanes to turn.

Demonstrate the Wonders of Light Energy

Showcasing the Crookes Radiometer in your classroom or laboratory invites students and observers to witness the direct transfer of energy from light to motion. Its transparent glass bulb and contrasting vanes make the motion easy to observe, stimulating curiosity and engaging learners in foundational physics concepts.

Superior Materials and User-Friendly Design

Crafted from laboratory-grade clear glass and lightweight metal vanes, the radiometer is built for clarity, durability, and consistent demonstration. Its stand-mounted design offers stable tabletop placement, while its lightweight structure (about 100 grams) ensures easy handling and minimal risk of damage during routine use.

Simple Maintenance and Packaging

Maintaining the Crookes Radiometer is straightforward; dust gently with a soft cloth and handle the glass with care to keep the device pristine for repeated demonstrations. Each unit is packaged individually in a protective carton, safeguarding it against potential damage during shipping and storage.

FAQ's of Crookes Radiometer:

Q: How does a Crookes Radiometer work?

A: A Crookes Radiometer operates based on the radiometric effect, where light energy strikes the four metal vanes (two black, two white) inside the partially evacuated glass bulb. The vanes rotate as light is absorbed and reflected, demonstrating the transfer of light energy into mechanical motion.

Q: What environments are suitable for using the radiometer?

A: The radiometer is best suited for controlled indoor environments such as classrooms, laboratories, and educational displays. Standard room temperatures are ideal, and it should not be exposed to extreme heat or cold.

Q: When will the vanes start to rotate?

A: The vanes begin to rotate when the device is placed under direct sunlight or exposed to sufficiently strong artificial light. The speed of rotation depends on the light intensity; brighter light causes faster motion.

Q: Where should I place the radiometer for best results?

A: Place the radiometer on a stable tabletop stand near a strong light source, such as a sunny window or under a bright lamp. Ensuring the glass bulb is clean and unobstructed will help maximize the observable rotation.

Q: What is the process for maintaining the Crookes Radiometer?

A: Keep the device dust-free by gently cleaning it with a soft cloth and always handle the glass bulb with care. Avoid striking or dropping the instrument to maintain the vacuum seal and functionality.

Q: How can the radiometer benefit physics education?

A: The Crookes Radiometer visually demonstrates the conversion of light energy into mechanical motion, providing an effective, hands-on way for students to grasp concepts in thermodynamics and optics. Its engaging movement makes complex principles accessible and memorable.

Q: What materials is the Crookes Radiometer made from?

A: The unit is constructed from superior laboratory-grade transparent glass for the bulb, and lightweight metal (typically aluminum or tin) for the vanes, ensuring durability and clear visibility for demonstrations.

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