Weights and Measures

	METRIC UNIT and SYMBOL	IMPERIAL to METRIC	METRIC to IMPERIAL
LENGTH	millimetre (mm) centimetre (cm = 10mm) metre (m = 100cm)	1 in = 25.4 mm 1 in = 2.54 cm 1 ft = 30.5 cm 1 yd = 0.914 m	1 mm = 0.0394 in 1 cm = 0.394 in 1 m = 3.28 ft
WEIGHT	gram (g) kilogram (kg = 1000g) tonne (t = 1000kg)	1 oz = 28.3 g 1 lb = 454 g 1 stone = 6.35 kg 1 ton = 1.02 t	1 g = 0.0353 oz 1 kg = 2.2 lb 1 kg = 0.157 stone 1 t = 0.98 ton
AREA	square centimetre (sq cm) square metre (sq m = 10000 sq cm)	1 sq in = 6.45 sq cm 1 sq ft = 929 sq cm 1 sq yd = 0.836 sq m	sq cm = 0.155 sq in 1 sq m = 10.8 sq ft 1 sq m = 1.2 sq yd
VOLUME	cubic centimetre  (q cm) cubic metre (q m = 1,000,000 q cm)	1 q in = 16.4 q cm 1 q ft = 28.300 q cm 1 q yd = 0.765 q m	1 q cm = 0.061 q in 1 q m = 35.3 q ft 1 q m = 1.31 q yd
VOLUME (liquids and gases)	millilitre (ml) litre (1 = 1000 ml) kilolitre (kl = 1000l = 1 q m)	1 fl oz = 28.4 ml 1 pint = 568 ml 1 gal = 4.55 litres	1 ml = 0.0352 fl oz 1 litre = 1.76 pints 1 kl = 220 gal
TEMPERATURE	degree Celsius (0*C)	*C = *F - 32 /9 then x 5  or - 32 then x by .55	*F = *C x 9/5 then + 32 or  x 1.8 then + 32
POWER	Kilowatt (KW)	1 hp = 0.746 KW	1 KW = 1.34 hp

SOME USEFULL CALCULATIONS

A METHOD FOR PREPARING ACCURATE DILUTIONS OF CHEMICALS AND DRUGS IN WATER by Austin Cartwright.		SOME OTHER USEFULL INFORMATION by Harry Watson
MATERIALS REQUIRED 1 x 1 litre glass flask 2 x bottles, each of at least 1 litre capacity 1 x 250 millilitres (ml) glass flask 1 x 10ml pipette, with rubber bulb. METHOD TO DILUTE TO 1 PART IN 1 MILLION 1. Take exactly 1 Gramme (1g) of the chemical 2. Put 250ml water in the 1 litre flask 3. Add the chemical and allow to dissolve completely 4. Add water to exactly 1 litre THE STRENGHT IS NOW 1 IN  1000 5. Pour the contents of the litre flask into a bottle 6. Wash the flask, then add 250ml water 7. Using the pipette withdraw a few ml from the bottle 8. Put 1ml from the pipette into the litre flask 9. Add water to exactly 1 litre. THE STRENGHT IS NOW 1 IN 1,000,000 (1 PPM) To prepare weaker solutions continue using the same procedure. For example, to make 1 in 4,000,000, place 250ml of the 1 ppm solution in the litre flask and top up with 750ml water. To make 1 in 25,000,000, take 40ml of the 1 ppm (40ml is 1/25 of 1 litre),by filling the pipette four times, and then make up to 1 litre with water. If care is taken, these procedures can be used with confidence to prepare very weak solutions,for example Dipterex or Malachite Green.		TO DISINFECT EGGS 1. Make up 1% solution of Malachite Green 2. Fill a large container with 300lts of fresh treated water 3. Add 100ml of the 1% solution 4. Add some air stones 5. When colour is uniform, add eggs and medium for exactly 15 mins 6. return eggs to hatching pond. OR Add 20ml of 1% solution per 1000lts of pond water. DOSAGES 1PPM = 1 part per million ..............1 milligram per litre ..............1 gramme per 1000 litres 10% with water = 90% water + 10% medication 10% in water = 100% water + 10% medication 1% solution = 10g of Malachite Green to 1 litre of distilled water 1 in 300,000 = 10ml of 1% solution to 30 litres ..........1ml = 16 drops Approx ..........2 1/2 ml = 40 drops ..........4ml = 64 drops ..........10ml = 160 drops