What is the difference between accuracy and precision and which is the most important to the scientific measurements?

What is a increase in stream velocity due to? What is the force that keeps two objects that are touching sliding past each other? Difference in conductivity between Distilled water and tap water? What is a unit of heat used to measure the energy your body uses and the energy your body uses the energy it receives from food? What is the difference between convection and convection currents? What is an factor that remains fixed during an experiment while the undemanding dependent variables change? Do the costs of wind power make it prohibitive for common use? What is a physical requirement of those expected to wear PPE? What is the transfer of heat energy within an object? What happens if you bypass thermostat in refrigerator? How do you describe a pen? If blue photons have higher energy than green photons why does green light carry the most energy? Is a baggie or beaker more concentrated in starch? What is the term defined as the recurrence of motion or sound? A machine requires a work input of 180-joules to achieve a work output of 140-joules. What is the efficiency of the machine? How is thermal energy determined? What happens if you drink a gallon of water in one sitting? How does a fluid-filled thermometer works? What will cause a dangerous shock when mixed with electricity? Could you spin your clothes in a spin dryer completely dry?

What is the difference between accuracy and precision and which is the most important to the scientific measurements?