Convection currents. The hot wax is less dense so it rises. When it reaches the top it begins to cool, becoming less dense and it sinks.
In a liquid (as solid particles in a liquid or in a lava lamp with two immiscible liquids) In the air, hot air rises, cold air descends (as in a hot air balloon)
It takes about 30-40 minutes before the wax inside the lamp is 'oozing' and flowing. After about 10 minutes, the wax will erupt from the bottom in a kind of stalagmite formation, which will then break up and sink to the bottom as it melts into liquid. Then the bubbles will start to rise and fall. The longer you leave the lamp on, the smaller the bubbles will be.
Convection is when hot substances rise and cool ones sink. The colored wax heats up at the bottom of the lamp where the bulb is, then rises up, cools, and sinks again.
The heat source typically heats up to high temperatures and this means solid wax lava lamps must melt first.
only at the start & end of the rise & fall
The "lava" in a lava lamp is just melted colored wax. Convection currents cause blobs of the wax to rise and fall in the clear mineral oil mixture.
The first lava lamp, created by inventor Edward Craven-Walker in the 1960s, had a distinctive design. It consisted of a glass container shaped like a colorful, teardrop-shaped lampshade filled with a mixture of colored wax and a translucent liquid, typically water. A light bulb at the base of the lamp heated the mixture, causing the wax to rise and fall in mesmerizing, lava-like blobs.
wax and water. when heated. the water becomes less dense than the wax causing the colored bubbles to rise and then fall. wax is generally what there is more of within the lava lamp. and as i said the bubbles that rise and fall are just colored or cloudy type water. CAUTION: never place lava lamp in a microwave.
why does the lava sink or rise?
Sorry have no idea?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????/
In a liquid (as solid particles in a liquid or in a lava lamp with two immiscible liquids) In the air, hot air rises, cold air descends (as in a hot air balloon)
It takes about 30-40 minutes before the wax inside the lamp is 'oozing' and flowing. After about 10 minutes, the wax will erupt from the bottom in a kind of stalagmite formation, which will then break up and sink to the bottom as it melts into liquid. Then the bubbles will start to rise and fall. The longer you leave the lamp on, the smaller the bubbles will be.
A lava lamp is a study in physics. The lamp functions on density and that density or mass as it is called, changes with the addition of heat to the container. When heat is applied the substance that floats changes to lighter mass and begins to rise. When it reaches the top where it is cooler, it gets dense and sinks.
Convection is when hot substances rise and cool ones sink. The colored wax heats up at the bottom of the lamp where the bulb is, then rises up, cools, and sinks again.
It is called a "lava lamp" and the effect is caused by the heat of the bulb in the lamp causing one of the liquids to warm up and become less dense than the other (it is denser in the cold state). The less dense glob then rises up and breaks off and travels to the top of the lamp where it cools then sinks once again to the bottom of the lamp.
The 'lava' in a Lava Lamp is actually a chemically treated wax. The clear (sometimes colored) liquid is water. When the lamp is turned on the metal coil inside the glass chamber is heated by the light bulb. The reason it sinks and rises is because when the molecules inside the wax get heated up and speed up and expand. This causes them to become less dense than the water causing them to rise. When they are at the top the molecules slowly get colder and they slow down which makes them more dense than the water, so the wax sinks.
I found that if the bulb was to hot that problem occurred,make sure it is the callled for wattage !