What do you have to do over and over again for even heat distribution of the PCR tube?

When we are talking about a traditional PCR tube moder day expirements would use a thermal cycler for even distrobution . Placing your tubes in a water bath or heat block moving your tubes from one temperature to another for thermal distrubution/ regulation. So basically moving and ajusting the temp.

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.