Breckland Scientific 2021 Catalogue

Energy

Calorimeters

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1 FOOD CALORIMETER Designed to investigate the energy value of food stuffs e.g peanuts. A peanut is burnt in the crucible using heat from the electrical element, which is supplied with electricity from a low voltage power supply. Connecting a joulemeter or voltmeter and ammeter allows the value of energy required to burn the peanut to be recorded. The glass vessel when filled with water provides 2 functions: as an insulator and a heat exchanger to measure the resulting rise in temperature. A filter pump is connected to the top of the spiral copper tube to draw off the combustion products. For a more efficient burn, the air inlet tube in the base can be connected to an oxygen supply. A metal stirrer is supplied to agitate the water sufficiently to ensure uniform temperature measurement. By measuring the total rise in water temperature, total energy supplied and by using the specific heat capacity of water, the additional energy transferred from the peanut can be determined. The unit consists of 2 main parts: The base plate with crucible and heating element, the glass vessel with the spiral copper tube. Equipment needed: Power supply, joulemeter or voltmeter & ammeter, thermometer, filter pump, rubber tubing and a retort stand. Optionally a source of oxygen can be used to ensure complete oxidisation. Cat No. Description Price Per HCA-250-100 Food Calorimeter 99.98 ea. 2 LASCELLS LEMON LED A low powered LED comes securely contained within a robust tube for protection. Suitable for use with lemons as ‘batteries’. Zinc and copper pieces for connections are not included but are available separately. Crocodile clips, leads and lemons not included. Cat No. Description Price Per HEC-415-100 Lemon LED 4.74 ea. 3 LEMON CLOCK Simply add your own lemon to turn this kit into an amazing lemon powered clock. Supplied with two metal rods consisting of copper and zinc and an LCD clock. Cat No. Description Price Per HEC-400-100 Lemon Clock 4.95 ea. 4 CROOKES RADIOMETER Perfect for demonstrating the conversion of radiant energy into mechanical energy. Comprising a partly evacuated glass bulb of about 70mm diameter with a fine pivot on which a rotor with a set of four mica vane arms is delicately balanced. Each mica vane has one side painted matt black with the other side bright. On exposing to sunlight or sufficiently bright incandescent light source, the absorption of radiant energy by the blackened side of the vanes sets up a temperature differential with respect to the bright sides, which causes net force to be exerted by the air molecules on the blackened side making the vanes rotate with their bright faces leading. Mounted on base. Cat No. Description Price Per HSE-050-100 Crookes Radiometer 11.64 ea. 5 HYMAN FIRE PISTON MK2 demonstrates the rise in temperature when a fixed mass of gas is compressed. A portion of tinder is ignited when the contained air is compressed by the piston. Also demonstrates the need for oxygen by attempting to re-ignite the tinder. It will only occur if fresh air is introduced to the cylinder. By compressing the air inside the cylinder and suddenly decompressing it, you will lower the temperature and condense the water vapour inside the cylinder to form a cloud. The new and improved Mk2 boasts a more robust construction. Cat No. Description Price Per HEC-300-100 Hyman Fire Piston Mk2 31.52 ea. HEC-300-150 Spare Cylinder for Mk2 7.11 ea. HEC-300-200 Tinder 4.92 ea. HEC-300-250 Lubricant 1.65 ea.

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Food Calorimeter

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Energy Conversion

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Lascells Lemon LED

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Lemon Clock

Crookes Radiometer

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Hyman Fire Piston

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