Given what we know, we can give the definition of these 20 words.
Density: magnitude that shows the correlation between mass and volume of a solution.
Hollow: having an empty space or concavity.
Solid: state of matter in which its particles are together and organized with great cohesion among themselves.
Conserve: to keep or protect something from some kind of damage or change.
Conduction: transmission of a charge through a body.
Convention: an established technique, form, or practice.
Current: a flow of electrically charged particles that travels through space.
Emit: release or discharge something such as a type of gas, liquid, light or sound.
Expand: increase the volume in a given space by some change in temperature.
Radiation: transmission of energy from a source through space.
Vigorously: done energetically or actively.
Porous: body that allows some fluid to pass through it.
Evaporation: it is a physical process in which it goes from the liquid state to the gaseous state. It can occur at any temperature
Isopropanol: colorless, flammable alcohol that can be mixed with water.
Condense: state of matter in which particles are packed closely together.
Temperature: thermal level of a body or the atmosphere.
Kinetic energy: energy possessed by a body by its motion.
Thermal energy: internal energy enclosed in a thermodynamic system in equilibrium that is proportional to its absolute temperature.
Condensation: is the change of matter from a gaseous state to a liquid state.
Mass: magnitude with which we measure the amount of matter that expresses a body.
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