Kim Christensen

Kim Christensen

Denmark
Denmark

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3,666 stock photos, vectors, and illustrations are available royalty-free.

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Closeup on samples of the metallic element Potassium (K). The samples need to stay covered in oil to prevent corrosion, even then a thin blueish layer of oxide has built on the surface..
Macroview on ampoule with the element No 35 bromine (Br) in both liquid and vapor state.
Fraction demonstration where sixth parts are reuced to thirds and then to one.
Cloaeup on some pellets of the element No 31:  Gallium
The inert gas Argon (Ar) seen in a discharge tube emits light due to an electric field.
Red Phosphorous powder in closeup.
Molecule model of Paraffin. White is Hydrogen, black is Carbon, yellow is Oxygen and green is Chlorine. The orange spheres represent charges in a coordinate covalent bond.
Macro of crystals of Iodine (I)
A strip of magnesium band burns held in  forceps, magnesium is a metal that can easily burn.
Molecule model of the sweetener Sucralose (E955). White is Hydrogen, black is Carbon, red is Oxygen, and green is chlorine.
Closeup on a piece of the periodic element No 21 Scandium (Sc)
View upwards from the bottom of a grave, a last glimpse of the sky.
Closeup on samples of the metallic element Lithium (Li) The sample needs to stay covered in oil to prevent corrosion.
The inert gas Crypton (Kr) seen in a discharge tube emits light due to an electric field.
Fraction demonstration setup featuring fifth parts being converted to decimal.
The inert gas Neon (Ne) seen in a discharge tube emits light due to an electric field.
Closeup with focus on the surface of a fracture in a car spring. This spring broke because of metal fatigue. The fracture has a matte crystalline surface, and some flaws and penetrative rust is seen
Piece of asbestos fabric formerly used for fireproof isolation. As can be seen the asbestos fabric has already dropped dust on the background surface despite very careful handling.
Precipitation reaction where two solutions are mixed din a glass. A potassium iodide solution is added to a lead nitrate solution, a chemical reaction takes place. A  yellow precipitate appears.
Closeup on a small piece of Boron (B)
Horizontally arranged Bimetallic strip is heated at one side and bends upwards.
Universal indicator paper for pH value is shown in use on a lemon with a pH value of approx. 3, and a piece of hand soap with a pH value of approx. 11.
Sample of the Alkali metal Caesium, element number 137. This reactive metal can only exist in a sealed glass ampoule
Closeup on the let foreleg of a white dog, the dog has acupuncture needles on the leg's triceps muscle
Fraction demonstration where sixth parts are reuced to thirds.
View into the mouth of an elder dog with focus on the upper molar to the left. Its roots are rotten, and this tooth needs to be drawn.
Sonderborg, Denmark - January 2, 2019: Storm surge with high water levels along the harbor face of the town.
Mathematic circle definition setup, the Professor poins at the centre of the circle, the small pair of compasses shows the radius, the large ones show the diameter
A person outside the frame blows air trough a solution of calcium hydroxide (lime water) The CO2 of the exhalation causes a reaction where solid chalk causes the liquid to become white and blurry.
Colored fire caused by an element. Sodium (Na) causes a yellow-orange color.
Close up on the splice of a heavy yellow mooring rope.
Colored water is poured trough 5 samples of soil:(l>r)sand, sandy soil, peat, humus and clay. The soil types ability to store and filter water (for pesticides) can be observed.
Mathematics setup with inequality:  A is larger than, or equal to B, with the corresponding denotion on the blackboard.
Magnetic field around a conductor. The compass needles align to the field generated by the current, rather than the geomagnetic poles. Black on the compass needles is north pole.
A red congored solution is poured into a clear acid solution and turns blue as the two liquids meet.
Universal indicator strips for pH value are shown in use on various solutions. The actual pH grade can be determined by comparing the strip's colors with a reference table.
A glass is placed over a burning candle that stands in water (green for better vision). The candle uses oxygen, and the water level rises up in the glass as the candle goes out due to lack of oxygen.
This road looks wet, but it is not, it is a mirage caused by a layer of hot air over the asphalt, heat distortion also obscuress the structures most far away
Molecule model of ATP, Adenosine Triphosphate. White is hydrogen, black is carbon, red is oxygen, darkblue is nitrogen, and lightblue Pphosphorous. Orange represents negative charges.
Molecule model of 4-hydroxyphenylalanine, a common amino acid. Black is Carbon, Red is Oxygen, white is Hydrogen, Blue is Nirogen
Molecule model of Hexane
Erosion on a small slope where growths are far from enough to prevent erosion.
Tubes with inert gases excited with high voltage. From left to right: Helium, Neon, Argon, Krypton and Xenon. Each tube emits a different color and intensity.
Testicles of elder male dog.
Two clear liquids, one alkaline, one phenolphtalein, are mixed and become purple red.
Mathematical sets. Set A contains some numbers dividable by 2, and Set B some numbers dividable by 3. The intersection contains numbers dividable by both 2 and 3.
Molecule model of the isomer isohexane and hexane. Both have same amount of molecules (C6H14) but are still very different.
A glass is placed over a burning candle that stands in water (green for better vision). The candle uses oxygen, and the water level rises up in the glass as the candle goes out due to lack of oxygen.
Extract of red cabbage. It changes color when added to samples with different pH grades from acid to alkaline (left to right)
Mathematic model setup illustrating a right-angled, an obtuse-angled and an acute-angled triangle. The Professor points at the right angle.
Calcium Carbide dissolves in water, creating Acetylene gas. This rather explosive gas burns with a yellow flame .
Light beams in colorblind-friendly colors pass trough a concave demonstration lens, the influence on the beams can be seen on the screen
Demonstration of a hoist featuring a single pulley block. The person only has to lift half of the weight, but must haul a longer distance.
First, second, and plug tap and die for cutting of 6 mm threads.
Pellets of pure elemental Silver (Ag)
Close up on axle that has broken due to metal fatigue.
Violet cornflower macroview, isolated on a dark background
Macroview of blue bellflower (Campanula persicifolia)
Blue cornflower macroview, isolated on a dark background
Macroview of beech leaves with galls.
Iodine evaporates, causing violet vapors to rise from the melt.
Speckled wood butterfly (Pararge egeria) sits in a common spruce in bright sunlight.
Red dragon fly Leucorrhinia dubia sits in sunlight on decayed tree trunk
Face portrait of a borzoi's long face resting in blooming heather.
Red dragon fly Leucorrhinia dubia sits in sunlight on decayed tree trunk
Face of white whippet dog resting in heather.
Side view of a Borzoi's long shaped head with heather as background.
Common blue buterfly Lycaena sits in blooming heather.
White whippet sitting in naturel environment with heather in bloom.
Closeup on a Sea Purslane cluster on a stone beach
Sample of a compound with the element No 88. Radium, It s radioactive and emits a greenish light
A Beilstein test can reveal halogens in plastic. Copper wire is heated and put on the iteml to test. PVC contains chlorine. The flame has a green color when the copper wire is put back in the fire.
Electrolysis of salt water, with methylene orange added as indicator. The indicator turns blue at the negative electrode (clack cord)  because ot the presence of OH- ions.
Champignon mushroom stands in an arc as part of a fairy ring.
Mathematics setup with inequality:  A is less than B, with the corresponding denotion on the blackboard.
White Whippet dog comes running with an orange ball in his mouth
A conductor is arranged as a swing, in a magnetic field (red=north). A current flows in the conductor and creates a magnetic field that interacts with the  permanent magnetic field.
Face portrait of a borzoi's long face resting in blooming heather.
White whippet sitting in naturel environment with heather in bloom.
Small tortoiseshell butterfly sits in blooming heather.
View into a dog's eye that is affected by cataract
Sonderborg, Denmark - Augut 15, 2021: Ritter Sport Cornflakes and Hula Hula chocolate bricks arranged in blooming heather.
Sonderborg, Denmark - Augut 15, 2021: Ritter Sport Marhaba chocolate brick arranged in blooming heather.
A conductor is arranged as a swing, in a magnetic field (red=north). A current flows in the conductor and creates a magnetic field that interacts with the  permanent magnetic field.
Atom model of a salt crystal, yellow is sodium, green is chlorine.
A tuft of steel wool has been submerged in a solution of copper sulfate. Thereby a thin layer of metallic copper has settled on the steel wool.
The inert gas Helium (He) seen in a discharge tube emits light due to an electric field.
Modelled trade situation that illustrates how a customer buys goods in a shop, pays and goes with his cake..
Molecule model of Toluene
A strip of magnesium band burns held in  forceps, magnesium is a metal that can easily burn.
Molecule model of the organic chemicals (left to right): Ethane, Ethene, and Ethyne (aka acetylene)
etup that shows how candles use oxygen. Three glasses placed over candles with short intervals starting from left. The colored water lifs up in the glass as the oxygen is ued.
Cross section of bicycle tyre with Kevlar reinforcement, and a thumb tack as reference.
Molecule model of Uranin, this pigment is an orange powder but becomes green when dissolved in water. White is hydrogen, black is carbon, red is oxygen and yellow sodium.
Molecule model of Carbonic Acid along with sample in a beaker. White is hydrogen, black is carbon, and red is oxygen.
Part of a hydrocarbon chain with a double bond. The difference between -cis and -trans  arrangement of the double bond can be seen. White is hydrogen, black is carbon.
Universal indicator paper for pH value is shown in use on a lemon with a pH value of approx. 2, and a piece of hand soap with a pH value of approx. 11
Precipitate from chemical reaction with lead and iodine settles in a tube, seen 4 minutes after the initial process.
Sonderborg, Denmark - June 30, 2021:Fishing hook picks a mastercard out of a pocket of a blue T-shirt.
Wiev into a field with blue cornflowers and red poppy.
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