I haven't done metric conversions since high school. I forgot there were 1,000 grams (nominally) to a liter. So 10 mg is roughly equivalent to .01 ml.
So a HempVape cartridge filled with their own oil or with "Tasty Vape" Hemp Oil ~should~ have approximately the same amount of CBD. So the Tasty Vape oil is only about five times cheaper.
Most oils are somewhat close to h2o.... They hover around 0.9 g/ml for density... Since D= m/V To convert volume to mass m= D*V. The trick is you would need to know the specific density of the hemp oil used... A quick google search showed around 0.93 g/ml. So for every one ml of hemp oil you have the mass equivalent would be approx. 0.93 grams
So yes if kannaways hempvap is 5% cbd... Then uou can assume almost 0.05 grams of cbd are in 1ml sample The other question that i am sure no one on board knows is sample purity. Just because they say 5% or 20% cbd doesnt mean its pure cbd.... When they strain the cbd for purity if they dont go through the extensive seperation process your 20% cbd may contain much less cbd purity than uou think... On independent lab testing can confirm this Glta