Star InactiveStar InactiveStar InactiveStar InactiveStar Inactive
 

The number of repeating corresponding points on a wave that pass a given observation point per unit time.

Latest Articles

  • Features of the Scanning Tunneling Microscope

    The scanning tunneling microscope (STM) invented by Heinrich Rohrer and Gerd Binnig in the 1980s still manages to do a great job today and competes with more advanced microscope types. The scanning tunneling microscope is used for studying the surface atoms that are found on various materials. The...

  • Chemical Safety

    People use chemicals every day for a wide array of purposes, which can include work and house hold duties. Many of us fail to realize that we are actually handling potentially deadly chemicals when we simply clean the bathroom or wash the car. This brings to mind the reason why chemical safety is...

  • Ozone

    We breathe 24 hours a day, 7 days a week, consuming about 25 kg of air every day. It turns out that we practically predetermine our health by the air we breathe.

  • Interesting facts about metals

    Metals have been used by people since ancient times. All the time the process of obtaining them was improved, useful alloys of various metals appeared. Let’s look at interesting facts about metals.

  • Gas of rotten eggs

    If you happen to break a rotten egg, then you know the smell of hydrogen sulfide, because the stench of the spoiled egg depends on of its presence in rotting protein substances.



Most Popular

Calorie

The amount of heat required to raise the temperature of one gram of water from 14.5°C to 15.5°C. 1 calorie = 4.184 joules.

Heat of Fusion

The amount of heat required to melt one gram of solid at its melting point with no change in temperature. Usually expressed in J/g. The molar heat of fusion is the amount of heat required to melt one mole of a solid at its melting point with no change in temperature and is usually expressed in kJ/mol.

Basic Anhydride

The oxide of a metal that reacts with water to form a base.

Alkaline Battery

A dry cell in which the electrolyte contains KOH.

Allotropic Modifications (Allotropes)

Different forms of the same element in the same physical state.

Exothermic

Describes processes that release heat energy.

Voltage

Potential difference between two electrodes, a measure of the chemical potential for a redox reaction to occur.

Manometer

A two-armed barometer.

Condensed Phases

The liquid and solid phases, phases in which particles interact strongly.

Density

Density is the ratio b/w Mass and Volume: D=M/V