When a sample of liquid is heated, its thermal energy: increases.
Thermal energy can be defined as the energy possessed by an object due to the movement of its particles.
Basically, the temperature of an object or system is highly dependent on thermal energy.
Hence, temperature is directly proportional to thermal energy.
Additionally, as the temperature of an object increases due to the application of heat, the thermal energy of the object increases.
In conclusion, thermal energy increases when a sample of liquid is heated.
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