Water is densest at 3.98°C and is least dense at 0°C (freezing point). Water density changes with temperature and salinity. When water freezes at 0°C, a rigid open lattice (like a web) of hydrogen-bonded molecules is formed. It is this open structure that makes ice less dense than liquid water.

At 39°F (or 3.98°C to be exact) water is the most dense. This is because the molecular structure and hydrogen bonding of the water takes up more space when it is a frozen solid rather than when it is a warmer liquid.

vapor

Water molecules are made up of oxygen and hydrogen atoms bonded together. Oxygen is heavier and smaller than carbon, so a volume of water molecules is heavier than the same volume of oil molecules. This makes water more dense than oil. Also, water molecules are very attracted to each other and pack very close together.

Lighter liquids (like water or vegetable oil) are less dense than heavier liquids (like honey or corn syrup) so they float on top of the heavier liquids….How Does It Work.

Material	Density (g/cm3)
Pancake Syrup	1.37
Light Corn Syrup	1.33
Dish Soap	1.06
Milk	1.03

Ice actually has a very different structure than liquid water, in that the molecules align themselves in a regular lattice rather than more randomly as in the liquid form. It happens that the lattice arrangement allows water molecules to be more spread out than in a liquid, and, thus, ice is less dense than water.

Most oils have a density around 90% that of water. They don’t mix in water and will float. Household vinegar consists almost entirely of water, but with some acetic acid molecules dissolved in it. In general, dissolving stuff in water makes it more dense, making vinegar the densest of the three.

Show the Animation Density of Liquids. Explain that to compare the density of oil and water you need to compare the weight of equal volumes of water and oil. Since the oil is lighter, it is less dense than water and floats on water.

A bubble and the air trapped inside of it are both very light. In order to float, the bubble hitches a ride on a gas that is slightly denser than the air trapped inside of it: carbon dioxide! The heavier carbon dioxide in the air around the bubble pushes up on the air trapped inside the bubble and off it goes.

Water molecules cling strongly to one another by forming these bonds from one molecule to another. Surfactants such as dish soap break up water’s surface tension. As a result, objects floating in water will sink or change shape as the surface tension changes.

Look at the pencil in the water. Look at the letters along the side of the pencil, as shown in picture A. The pencil would float higher than it did before the extra salt was added. The pencil would float at the same level as it did before the extra salt was added.

Gold is hydrophobic: it repels water. Because of this, even if the piece of gold is first completely submerged, if it gets near the surface it will throw off the water above it and float. Since most placer gold is flat and thin, its weight is small relative to its circumference so it will usually float.

It seems to defy the laws of physics, but a paper clip made of steel can indeed float on the water surface. The high surface tension helps the paper clip – with much higher density – float on the water. The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension.

A metal spoon, a plastic spoon, a metal paper clip, a coin, a ping-pong ball, an apple, and an orange. The metal items will sink and everything else will float. The apple, ping pong ball, orange, and plastic spoon will float.

The metal spoon is denser than water, so it would sink. Shape is also important for floating.

Pumpkins and apples float in the water because they are less dense than the water – meaning they are buoyant. The fall fruits contain a lot of air (even pumpkins because they are mainly hollow inside despite their size).

Does the sponge sink or float? By squeezing out all the air bubbles the sponge has less air pockets and therefore it will sink to the bottom. As the sponge absorbs the water and has less air pockets, the heavier it becomes and therefore it will sink lower in the water instead of floating on top of the surface/water.

As the water was absorbed into the sponge, it would become denser and denser as the air was displaced by water(i.e. air =less sense, water = more dense) Eventually, the sponge would be saturated, and the sponge would either be floating just at the surface of the water, mostly submerged, or if the sponge density was …

The sponge is lighter than water and rubber block is more denser than water. Hence, the sponge floats and rubber block sinks.

When you put a sponge in water, it absorbs it. This happens because the bubble like spaces inside the sponge have the ability to hold water and the sponge material locks it in. Water won’t be released until someone forces it out through squeezing or it could be allowed to dry out over time.

Objects like apples, wood, and sponges are less dense than water. They will float. Many hollow things like empty bottles, balls, and balloons will also float. That’s because air is less dense than water.

A sponge can absorb water; that is, the water clings to the sponge and fills up the holes in the sponge. You can squeeze the sponge to release the water (but you can’t squeeze it completely dry!).

The many holes of a sponge hold water because of a scientific concept known as surface tension. Surface tension is the slight amount of elasticity that exists between the molecules of water that holds them together. Each tiny hole inside a sponge is its own little pocket of surface tension.

So, what is full of holes but still holds water? The answer is a sponge! This one’s actually a bit of a classic but with so many riddles back in the limelight, we’re hardly surprised to see it return.

Q5# I’m light as a feather, yet the strongest person can’t hold me for five minutes….Amazon Quiz Answers- What is full of holes but still holds water?

Correct Answers 1:	All of them
Correct Answers 3:	A candle
Correct Answers 4:	The letter R

Answer 2: (C) Sponge Q3: I’m tall when I’m young, and I’m short when I’m old.

Explanation: A Promise” can be break, even if we never pick it up or touch it. Given: What can you break, even if you never pick it up or touch it? A Promise is a correct answer to this riddle.

Answer. Answer: This question is a riddle and the answer for what disappears as soon as you say its name is silence. There is silence until and unless any kind of sound is made but it fades or disappears as soon as something is said or a sound been made that breaks the silence.

The answer to What gets wet while Drying Riddle is A Bath Towel.