Approximate conversions for cooking are ...
1 tsp ≈ 5 mL, so 1/2 tsp is about 2.5 mL
1 Tbsp ≈ 15 mL
1 cup ≈ 240 mL, so 1 1/2 cups ≈ 355 mL*
1 1/2 lb ≈ 680 g
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* 1 cup is about 236.6 mL.
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Many cookbooks have tables of equivalents.