var ara =  new Array(); 
//Metric System
ara[0] = 1;//gram
ara[1] = .000001;//microgram
ara[2] = .001;//milligram
ara[3] = .01;//centigram
ara[4] = .1;//decigram (dg)
ara[5] = 10;//dekagram (dag)
ara[6] = 100;//hectogram (hg)
ara[7] = 1000;//kilogram
ara[8] = 1000000;//megagram = metric ton (t/Mg)

//Troy Units
ara[9] = 64.79891*ara[2]; //grain = 64.79891 milligram
ara[10] = ara[9]*24; //pennyweight (dwt) = 24 grains
ara[11] = ara[10]*20; //ounce (oz t) = 20 dwt
ara[12] = ara[11]*12; // pound (lb t) = 12 oz t

// Avoirdupois mass units
ara[13] = 64.79891*ara[2]; //grain = 64.79891 milligram
ara[14] = ara[13]*27.34375; //dram (dr) = 27.34375 =(27 11/32) grains
ara[15] = ara[14]*16; //ounce (oz) = 16 drams
ara[16] = ara[15]*16; // pound (lb) = 16 oz
ara[17] = ara[16]*100; // hundredweight (cwt) = 100lb
ara[18] = ara[17]*20; // ton = 20 cwt
ara[19] = ara[16]*112; // long (gross) hundredweight = 112lb
ara[20] = ara[19]*20; // gross/long ton = 20 (gross) hundredweight

// Apothecaries Units of Mass
ara[21] = 64.79891*ara[2]; //grain = 64.79891 milligram
ara[22] = ara[21]*20; //scruple (s ap) = 20 grains
ara[23] = ara[22]*3; //dram (dr ap) = 3 scruple ap
ara[24] = ara[23]*8; //ounce (oz ap) = 8 drams ap
ara[25] = ara[24]*12; // pound (lb ap) = 12 oz ap

// Other Units of Mass
ara[26] = ara[2]*200; //carat (c) = 200 milligrams
ara[27] = ara[1]; //gamma (y) =  1 microgram



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