Chemistry

By sjd2194

  • Evangelista Torricelli invented the mercury barometer.

    A barometer is a scientific instrument used in meteorology to measure atmospheric pressure.

  • Otto von Guericke constructed the first vacuum pump.

    A vacuum pump is a device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum.

  • James Bradley Uses aberration of starlight to determine the speed of light to within 5%. accuracy.

    the speed of light is 299,792,458 metres per second, a figure that is exact since the length of the metre is defined from this constant and the international standard for time.In imperial units this speed is approximately 186,282 miles per second.

  • Benjamin Franklin demonstrated that lightning is electricity.

    Lightning is an atmospheric electrical discharge (spark) accompanied by thunder.

  • Charles Coulomb Introduced the inverse-square law of electrostatics.

    Electrostatics is the branch of physics that deals with the phenomena and properties of stationary or slow-moving (without acceleration) electric charges.

  • Alessandro Volta invented the first electric battery

    An electrical battery is one or more electrochemical cells that convert stored chemical energy into electrical energy.

  • William Strugeoin invented the electromagnet.

    An electromagnet is a type of magnet in which the magnetic field is produced by the flow of electric current.

  • Robert Brown discovered Brownian motion.

    Brownian motion is the presumably random drifting of particles suspended in a fluid (a liquid or a gas) or the mathematical model used to describe such random movements, which is often called a particle theory.

  • Lord Kelvin described the absolute zero point of temperature.

    Absolute zero is the theoretical temperature at which entropy reaches its minimum value.

  • James Joule experimentally demonstrated that heat is a form of energy.

    Heat is energy transferred from one system to another by thermal interaction.

  • James Maxwell Clerk proposed that electric and magnetic fields filled space.

    An electric field is the region of space surrounding electrically charged particles and time-varying magnetic fields.

  • Heinrich Hertz discovered the photoelectric effect.

    In the photoelectric effect, electrons are emitted from matter (metals and non-metallic solids, liquids or gases) as a consequence of their absorption of energy from electromagnetic radiation of very short wavelength, such as visible or ultraviolet radiation.

  • F.H.C. Crick described the structure of the DNA molecule

    DNA is a nucleic acid containing the genetic instructions used in the development and functioning of all known living organisms.

  • Aston Use a mass spectrograph to demonstrate the existence of isotopes.

    Isotopes are variants of a particular chemical element. While all isotopes of a given element share the same number of protons, each isotope differs from the others in its number of neutrons

  • Sir Alexander Flemming discovered the antibiotic penicillin

    Penicillin is a group of antibiotics derived from Penicillium fungi.