Photons

Photons have no mass but a momentum.  Unbelievably, Scientists can now use light to make matter move.  Because of this property NIST the (National Institute of Standards and Technology) have taken this property and used it to develop devices that can create and measure minute forces such as in metrology.  In this community the official SI force unit is measured as 1 newton.  One newton is about the weight of an average sized apple.  The experiments that this community are doing is doing studies on how tiny forces that are a fraction of a newton.  These forces ca  be used by the PML team to do such things as atomic interactions.  For example, just like a star is being born or lightning they can use a chip-sized sensor that can use micro- to milliwatt-power light.  They can also use tabletop devices worth about 1 watt but can produce 10 kilowatts of power.  ([Measuring Tiny Forces with Light)]: NASA Tech Briefs, February 2017)