Why are there some values of thermal energy that cannot be cleared?

[phet-steele]

I'm seeing this limit in EnergyGraphNode.js that decides whether the user can clear thermal energy:

  model.firstSpring.thermalEnergyProperty.link( function( value ) {
      clearThermalButton.enabled = ( value > 0.001 );
      clearThermalButton.pickable = ( value > 0.001 );
    }

I can't find documentation about why the limit of 0.001 was chosen. This coupled with the ability to zoom in makes the sim look buggy; thermal energy is shown but cannot be cleared:

The value of energy in the screenshot must be less than or equal to 0.001. @arouinfar @Denz1994 why is this limit in place? Would js just not work if the check was value > 0?

[Denz1994]

I don't think there was a specific reason for this. This may have been introduced prior to the refactors to the energyGraphNode. I don't see a good reason to keep it around and it has been replaced with the above suggestion by @phet-steele. Leaving to @arouinfar to close if all seems good.

[arouinfar]

I see no reason to have such a limit. Good find @phet-steele.